![]() 'Thought I'd opened Grindr!': Jennifer Lopez baffles fans with 'cringe' shirtless snap of Ben Affleck in 'weird' Father's Day tribute Kate Ferdinand details her pregnancy struggles and feeling 'guilty' about the age gap between her babies and teenage stepchildren Victoria Beckham lets loose with David and pals including Guy Ritchie and Jacqui Ainsley (but she still won't let anyone see her smiling!) Thinking of starting a side hustle? Here's an online tool you NEED to know about Jonnie Irwin celebrates 'the best Father's Day ever' as he shares adorable family snaps from emotional day amid terminal cancer battle Long-time pals Eddie Redmayne, 41, and Andrew Garfield, 39, enjoy a giddy meet-up in London. Man who hit Bebe Rexha in the face with a phone is ARRESTED after singer fell to her knees in agony during concert in NYC 'I couldn't be more proud than to stand shoulder-to-shoulder with those guys on this challenge,' added Antony. He admitted beforehand it would be his most terrifying stunt ever and revealed he had to prepare himself by concentrating on breathing techniques to overcome his fear. ![]() Both failed and had to be dug out by their crews. Legendary escapologist Harry Houdini attempted the feat in 1915 while British master of the craft Alan Alan tried it in 1949. Mr Britton is only the third person in 100 years to attempt the Buried Alive escape. 'I gave it my all, but it just wasn't my day,' he said. Speaking last week about the incident, he said his biggest disappointment was to discover that he was just two feet from the surface when he had to be rescued. It is not performed in a coffin because it would be impossible for the lid to be lifted. Experts say the stunt is so difficult because the weight of the soil makes it almost impossible to move and creates a lack of oxygen. He was unable to move and after several minutes his assistants dug him out unconscious and revived him. A rope was his only way of communicating with the surface. The second attempt at the stunt was in 1949 by Alan Alan, 22, from Manchester, who was buried with a strip of cardboard over his body. Houdini (left) was the first to attempt the Buried Alive stunt (poster right), near Santa Ana, California in 1915
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![]() There are annoying cases like the YouTube download option not showing and YouTube waiting to download but unresponsive. 3D and 360-degree videos are also out of the question, and very few can handle 4K.People may be upset that they can't download YouTube videos because the YouTube downloader is not working. They only allow you to download a single video at a time, and you can forget about saving whole playlists. Online video converters typically don't give you much (if any) choice about the video file either, in terms of quality or expert format. Many such sites also feature ads of an NSFW variety, or display thumbnails of recently downloaded videos, which may not be appropriate. First of all, they're slower due to the limitations of the remote server and your data connection. There are many sites that you can use to download YouTube videos, but we don't recommend them due to their disadvantages over desktop software. What's the difference between Online YouTube downloaders and desktop apps? Read our full review: aTube Catcher Is it legal to downloaded YouTube videos?īefore you use a free YouTube downloader, bear in mind that using third-party apps to download videos is against YouTube's terms of service, which say you can only stream videos directly from its servers.ĭownloading videos is also potentially a copyright infringement unless you own the video yourself, have permission from the copyright holder, or it's in the public domain. This free YouTube downloader offers plenty of added extras too, such as the ability to record any on-screen video, video merging, and disc burning. If you're looking to download a large number of videos, you can download them all at once, maxing out your bandwidth – something not available in all of the best free YouTube downloaders on this list. When you're offered the first app, make sure to hit Cancel, and for the second one click Decline – then you'll be free to enjoy aTube Catcher without any unwanted surprises.ĭownloaded videos can be converted automatically to a number of popular formats, so you can tailor them for their intended use, or whatever device you intend to watch them on. Read our full review: 4K Video DownloaderĪlthough the name suggests that this is just a YouTube downloader, aTube Catcher can actually save videos from most of the big video hosting sites.įirst, however, a word of warning: sneaky adware abounds during the installation. You can download captions for individual videos, and there's support for 3D and 360-degree videos too.ĭelving into the properties lets you tweak options like multi-stream downloads (increasing the number of streams will speed up downloads, but increases the risk of YouTube blocking your IP address) and set up a proxy connection.īuying a key will let you download longer playlists and playlists with captions, and at £7.95 (about US$10, AU$15) for a lifetime license for three PCs, it's a bargain, but the free edition has everything else you could wish for. There's a great choice of formats – both video and audio – including MP4 and MP3. To grab a video (or a whole playlist, provided it's not longer than 24 videos), simply copy its URL from your web browser, click 'Paste URL' and select an output format, quality and location. ![]() ![]() It's simple to use, highly customizable, ad-free and doesn't include any bundled extra software. 4K Video Downloader is the best free YouTube downloader around for quick, fuss-free YouTube downloads. ![]() We will gladly provide you with a durable garage made of the concrete that locals depend on. We provide gorgeous concrete pool decks that will bring your outdoor oasis to life.Ĭoncrete Garages: We can do single garages or multiple-car garages. If your pool deck or patio is aging or falling apart, your pool is not going to look its best, no matter how new and shiny it is. Our network is able to tackle a large variety of projects, including the following:Ĭoncrete Pool Decks: Do you have a swimming pool? If you do, you know how important it is to make sure your entire pool area is looking pristine. Whether you are interested in a new driveway, patio, basic slab, or stamped concrete Skeetown Concrete Co has you covered! Our network is known in the community for doing excellent work and enhancing the value of your property. When you hire our partners, you can rest assured that they will do a fantastic job and provide you with high quality results. We can pour concrete on just about any surface. Got another project in mind for Skeetown Concrete Co? We’ve got you covered! Seriously… our partners do it all!Ĭommercial & Residential Concrete Contractors of Muskegon Skeetown Concrete Co offers you skilled workmanship and the best quality materials for concrete repairs in Muskegon for all of concrete projects. Concrete is an exceptional choice of material for a large variety of surfaces, due to its long-lasting durability and easy maintenance. ![]() They do all kinds of new concrete pours, and we also provide the high-quality foundation repair that Muskegon residents can depend on. Our network of contractors can tackle anything from basic concrete slabs to building concrete foundations to concrete repair that Muskegon, Michigan locals will appreciate – they have the skills and experience to do it all. When you trust our partners with your project, they will give you the highest quality craftsmanship! Our network of residential concrete contractors of Muskegon, Michigan can handle residential and commercial projects. 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Whether you're building a freestanding deck, walkway, shed, or other exterior structure, the versatile CAMO BLOCK is the right foundation for the job. Weighing only 2.16lbs but load-rated to support over 1800lbs, CAMO BLOCK is an easy-to-carry deck foundation that also nests together for easy transport. Gone are the days of taking multiple trips to the store-and breaking your back-to build a freestanding deck. Block Heavy-Duty Polyolefin Deck Block CAMO BLOCK is a lightweight, heavy-duty alternative CAMO BLOCK is a lightweight, heavy-duty alternative to concrete deck blocks. ![]() Therefore, 54 percent to fraction is 27/50. Step 2: Now, express 54/100 in the simplest form, which is 27/50.Step 1: Remove the percent sign and divide it by 100.To express 54% in fractional form, we will follow the steps mentioned below: Let us solve a simple example to clearly understand this explanation. Simplify the fraction to obtain the required answer.Remove the percentage symbol by dividing the fraction by 100.Convert the decimal percentage into a fraction percent by dividing it with a power of 10 containing as many zeros as the number of decimal places in the decimal percent given.The decimal percent can be easily converted into a fraction by following the steps given below: How to Convert Decimal Percent to Fraction? Let us look at a simple example to understand better. The fraction is then simplified to obtain the answer.Divide it by 100, and remove the percentage symbol.Convert the mixed fraction to an improper fraction.The steps given below are to be followed to convert mixed percent to a fraction: The process to convert a mixed percent to a fraction is very simple. How to Convert Mixed Percent to Fraction? For example, 1% is 1/100, 2% is 2/100 which can be reduced to 1/50. And, then we express the fractional form of the percentage in the simplest form. To convert a percent to a fraction, we have to remove the percent sign and divide the given number by 100. For this we can simply remove the percentage symbol and replace it with a 100 in the denominator, to obtain the required fraction. Here, we need to convert a percent to a fraction. Percent to a fraction is the interpretation of the given percentage in fractional form. To convert mixed number percent to fraction, convert mixed to an improper fraction and then divide it by 100.Ĭheck these interesting articles to know more about the concept of a percent to fraction and its related topics.įAQs on Percent to Fraction What is Percent to Fraction?.Then, multiply the denominator with a power of 10 with as many zeros as the decimal places in the numerator. To convert decimal percent to fraction, remove the decimal point and then divide by 100.While converting percent to fraction, we divide the given percentage by 100 and remove the percent sign.While converting fraction to percent, we multiply the given fraction by 100.Here let us look at the percent to fraction chart given below. Further, reduce the fraction to obtain the simplest fraction value. The numerical value is in the numerator and the number 100 is in the denominator and it forms a fraction. The process to convert a percent to a fraction is to remove the percent symbol and divide the number by 100. Percent to fraction conversion is very helpful in calculations. ![]() Given below is a simple percent to fraction conversion table that shows all forms of conversions written above. Step 3: Reduce this fraction to its lowest form by finding the GCF of the numerator and denominator.Multiply both numerator and denominator by 10. Step 2: Drop the decimal point of the numerator.Step 1: Drop the % symbol and divide it by 100.To convert decimal percent to fraction, follow the steps given below. Step 3: Reduce it to the lowest form, i.e.Step 2: Drop the percent symbol %, multiplying by 1/100.To convert mixed number percent to fraction, follow the steps given below. If there are 45 girls out of 100 students in the class, we mean 45% of the students are girls. Let us look at a simple example to understand more. Step 2: Reduce the fraction with 100 as the denominator, into a simple fraction.Step 1: Remove the percent symbol and divide it by 100.To convert the whole number percent to a fraction, the following steps can be used: Let us now look at the following conversions from one form to another form. ![]() In all the cases the percentage symbol is dropped and the numeric value is divided by the number 100. The numeric value of the percentage could be a whole number, a fraction, or a decimal. Further, it depends on the numerical value of the percentage. The conversion of a percent to a fraction is very simple and convenient. ![]() Is there a downside to using a projector screen? If you have a smooth screen texture, 4K and higher definition videos can be shown. Textured surfaces can make projected pixels appear jerky or even rigid because the surface is not completely smooth. A texture-free picture has a more vivid appearance since the projector’s pixels are not deformed or altered in any way. High-end projector displays don’t have any texture. ![]() Similar to this, if you want to improve the image’s dark levels, you may lower the gain. Increasing the gain level may be necessary in order to maintain the brightness of the picture on a bigger screen. More Brightness Or Less brightnessĪnother feature of home cinema projector screens is the ability to adjust their gain levels. A quality projector screen would not have this effect since its surface is carefully adjusted to have no color-shifting effects. Contrary to popular belief, there may be tinting in the white and gray spectrums, which means that the white balance can be somewhat shifted toward the yellow or blue end of the range depending on the exposure. With a high-quality projector screen, color balance isn’t affected by its calibration. While your eye will never perceive a single distorted pixel, without a movie screen, you will likely be able to discern a loss of sharpness, clarity and dynamism when compared with a premium screen that is correctly calibrated to your projector’s high resolution. A projector’s actual resolution is only visible to the spectator when it hits a surface that does not obstruct the integrity of the pixels.ĭisruption and distortion of pixel geometry may occur on any surface that lacks perfect flatness or has any pattern with a gradient bigger than the individual size of the projector’s pixels. In addition to their many benefits, they have the following: Higher Image ResolutionĪ high-quality projector screen is intended to showcase the full potential of your high-resolution projector. Providing you with the greatest possible image. Dedicated screens are produced with optical coatings that improve their reflecting characteristics. There are a variety of uses for home cinema displays, including watching movies or playing video games at home or giving presentations.Ī projector screen is a must if you want to get the most from your projector. What is a projector screen?Ī projector screen is just a surface on which a video projector’s picture is projected. Learn how to build a projector screen that meets your specific demands by reading this guide first. There is no better place to be than here. Whatever your project is, whether it’s a movie screening in your basement, a gaming room you’ll practically live in, a house projector for any party, or a giant movable backyard screen, we’re here to help you get it done! Buying Guides For TV & Projector | Helpful Video ![]() ![]() Wi-Fi now costs $8, that allows for streaming live television, movies, streaming music, and app messaging. Southwest has a "customer of size" policy in which the cost of a second seat is refunded for any plus-sized travelers who take up more room than one seat. The airline was also number-one on the 2020 Airline Quality Rating list. A 2012 study on the television series MythBusters, found this to be the fastest method currently in use for passengers to board a plane on average, it is 10 minutes faster than the standard method. Passengers line up in numerical order within each letter group and choose any open seat on the aircraft. Each passenger receives a letter (A, B, or C) and a number 1 through 60. In 2007, Southwest modified its boarding procedure by introducing a number. Passengers would line up at their specified letter and board. Prior to 2007, Southwest boarded passengers by grouping the passengers into three groups, labeled A, B and C. Southwest has become known for colorful boarding announcements and crews who sometimes burst out in song. They also have complimentary snacks on all flights. Free alcoholic drinks are offered on some holidays such as Valentine's Day and Halloween. Southwest offers free in-flight nonalcoholic beverages and offers alcoholic beverages for sale for $6 to $7 per beverage. In the event of a cancellation, passengers are refunded a travel credit in the amount spent on their ticket, and the credit may be used toward other Southwest Airlines or Southwest Vacations purchase. The company permits two free-of-charge checked bags per passenger, and passengers are permitted to change their flight up to 10 minutes prior to their flights without extra charge. Still, Southwest does offer many amenities, as follows: Southwest solely offers economy-class seats, and does not have business- or first-class cabins on its aircraft. History Ī Southwest 737-800 at Baltimore–Washington International Airport The airline has nearly 66,100 employees and operates about 4,000 departures a day during peak travel season. It exclusively uses Boeing 737 jets in its fleet. Southwest's business model is distinct from other US airlines as it uses a rolling hub and point-to-point network and allows free checked baggage. Southwest currently serves airports in 42 states and multiple Central American destinations. It began regional interstate service in 1979, expanding nationwide in the following decades. and adopted its current name, Southwest Airlines Co., in 1971, when it began operating as an intrastate airline wholly within the state of Texas, first flying between Dallas, Houston, and San Antonio. The airline was established on March 9, 1967, by Herb Kelleher and Rollin King as Air Southwest Co. As of 2018, Southwest carried more domestic passengers than any other United States airline. It is headquartered in Dallas, Texas, and has scheduled service to 121 destinations in the United States and 10 additional countries. Southwest Airlines Co., typically referred to as Southwest, is an airline based in the United States and the world's largest low-cost carrier. My investigations show that many common mobile authenticator apps accept QR codes for hash algorithms, periods and number of digits they don’t support. Varying the number of digits is not mentioned in the TOTP standard apart from in the Java reference implementation, but it’s mentioned as an extension in the underlying HMAC-Based One-Time Password Algorithm (HOTP) standard ( RFC 4226) in Appendix E.1:Ī simple enhancement in terms of security would be to extract more digits from the HMAC-SHA-1 value.įor instance, calculating the HOTP value modulo 10^8 to build an 8-digit HOTP value would reduce the probability of success of the adversary from sv/10^6 to sv/10^8. The digits parameter may have the values 6 or 8, and determines how long of a one-time passcode to display to the user. The HMAC-SHA-1 hash function is the default but HMAC-SHA-256 and HMAC-SHA-512 are also allowed. The QR code encodes text on the so called Key URI format as per a Google Authenticator wiki article: TOTP standard recommends a default time-step size of 30 seconds. The de-facto standard is to transfer TOTP parameters including the secret (key) using a QR code. Thanks, git log -S Conclusion -walk-reflogs -patch! ![]() I got the idea for this blog post and now I’ve finally executed it and compared eight different TOTP apps for the two mobile platforms:ĮDIT: This section except for the last paragraph was accidentally deleted before publication and was restored two hours later. In October 2017 when I evaluated HashiCorp Vault for generating and storing TOTP secrets for a system at work I realized that the Android version and iOS version of Google Authenticator differed a lot when it comes to which modes are supported. The method is called Time-Based One-Time Password Algorithm (TOTP) and is standardized in RFC 6238. You probably use an “authenticator app” such as Google Authenticator to enable two-step verification (sometimes called two-factor authentication, 2FA, or multi-factor authentication, MFA) for an online account. ![]() ![]() Many Common Mobile Authenticator Apps Accept QR Codes for Modes They Don't Support ![]() It’s a top five of classic British biscuits that have been around for many years, and which are all well suited to dunking in a nice cup of tea. Ian Atkinson, CMO at SunLife said: “The results of our biscuit poll make quite surprising reading, but I’m happy to see the Ginger Nut (a personal favourite) taking the top spot. ![]() “Fruit shortcake – can’t dunk chocolate in tea!” Howard “I love most biscuits, but chocolate digestive and ginger nuts are the best with tea for me.” Jenny A traditional feel with up to trend results Two Bits Men’s Grooming Salon, Saint Joseph, Minnesota. Just like supporting the scrappy upstart. They were started by someone who left Old Bank, so I feel like they're a challenger brand. Went to Two Bits in Hampden and they did a great job. We pride ourselves in having a fantastic team that offers incredible treatments and unbeatable customer service at rates we can stand behind. ago I didn't get my haircut since February. “I love all biccies, but a dunked bourbon is my best.” Julie (443) 449-6705 WHO WE ARE Nestled in the heart of Baltimore, we at Two Bits Barbershop embody the tradition of the old style barbering with a modern vision. ![]() “Any biscuit that can be dunked into a cuppa at the time of drinking is the best biscuit!!” Dee The poll also discovered that dunkability is a key factor for older Brits, with many of the poll’s respondents citing ‘dunking’ as a reason for their choice of biscuit: The five that came in after Nice biscuits were Fruit Shortcakes, plain Hobnobs, Garibaldis, Fig Rolls and chocolate Hobnobs. The only chocolate biscuits in the top ten were the Chocolate Digestive (6) and Bourbon (8), and only three with ‘fillings’ made the top ten – Custard Creams, Jammy Dodgers and Bourbons. Canton Corner Barber Shop Barbers (1) Website (410) 624-5899 2809 Hudson St Baltimore. In second place was Rich Tea, followed by a plain Digestive and a Custard Cream, while Shortbread made up the top five. Womens haircut barber shop The clear, single-zip bags include. So, given older Brits are the biscuit authority, over 50s experts SunLife polled more than 450 of them to find out their biccie of choice. Gospel Singer from Baltimore, MD (22 miles from Maryland) Gospel Singer. One in four people tuck into biscuits daily, and as a nation we spend more than £3bn on the sugary snacks year.Īnd it is older Brits that love biscuits the most – 31% admit to eating at least one a day, and they put taste above all other factors when purchasing their favourite snack – even if it means spending a bit more. Singers who perform with live musicians may charge a bit more than those who. The humble biscuit has been a British staple for hundreds of years, and even in the midst of a cost-of-living crisis, shoppers are showing no signs of quitting their habit. These can lead to new traits, such as altered coloration, new susceptibility to disease or protection from it, or different shaped features (such as legs, antennae, toes or internal organs). In living organisms, the evolution usually involves random changes to genes that will then be passed along to an individual’s offspring. The newer type is not necessarily more “advanced,” just better adapted to the conditions in which it developed.Įvolve To change gradually over generations, or a long period of time. These changes usually result in a new type of organism better suited for its environment than the earlier type. A second line of so-called bird-hipped, or ornithischian dinosaurs, led to a widely differing group of animals that included the stegosaurs and duckbilled dinosaurs.Įvolution A process by which species undergo changes over time, usually through genetic variation and natural selection. rex and the lumbering four-footed Apatosaurus (once known as brontosaurus). The lizard-hipped line became saurichians, such as two-footed theropods like T. Their descendants eventually split into two lines. All descended from egg-laying reptiles known as archosaurs. These ancient reptiles lived from about 250 million years ago to roughly 65 million years ago. Used as an adjective, the term would be cranial.ĭinosaur A term that means terrible lizard. Still, he told Science News that Caldwell’s team makes “a good case for these fossils being related to snakes.” In fact, he adds: “These fossils are the best candidates we’ve seen yet for early snake relatives.” Power Words (for more about Power Words, click here)Ĭranium The part of the skull that protects the brain. He’s a paleontologist at the University of Bath in England. “With only bits of skeleton to work with, it’s easy to make a mistake,” cautions Nicholas Longrich. (The researchers assume that they had four legs because snake species that lived tens of millions of years later had hind legs.) But even looking only at head fossils can help scientists answer questions about how life has changed over vast periods of time. ![]() That means they know little about what the rest of the body looked like. That helped them hold fast to wriggling prey.Ĭaldwell and his team based their study only on skull fossils. Indeed, Caldwell notes: “Snakes have very mobile skulls.” Besides being flexible, the ancient skulls - like in modern snakes - had teeth that curved backwards. Skull shape, and not the legless body, was the feature that gave snakes an early survival edge, the new study suggests. However, they already had developed their special skulls. Those ancient animals most likely still had four small legs, Caldwell told Science News. All were between 143 million and 167 million years old. The researchers found four new species of snakes. ![]() So for 10 years his team searched other museum collections. That discovery made him wonder if other ancient snakes had been overlooked in fossil collections. At one point he came across snake bones from the Jurassic Period. This project began while he was examining lizard fossils from England. He has been working on the new analysis of ancient snakes for more than a decade. Michael Caldwell is a paleontologist at the University of Alberta in Canada. But the new study’s authors now “challenge this,” he says, “and present a new head-first hypothesis.” “It allows constriction, an ancient predation strategy.” A highly mobile skull would have come later, he told Science News. Scientists who study snakes had assumed “the long body evolved first,” he notes. A paleontologist at the Senckenberg Museum in Frankfurt, Germany, he did not work on the new study. Indeed, the new findings challenge a common assumption about how snakes evolved, says Krister Smith. PH =0.0 - 3.6 color change = orange to red The colour change from pink to pale yellow is almost instantaneous at about 80oC. (metal-ion EDTA)ĭissolve 0.1g of the dyestuff in 50ml, ethanol. Sodium salt of 4-(2-hydroxy-4-sulpho-1-naphthylazo)-3-methyl-1-phenyl-2-pyrazolin-5-one (IX)-a pyrazolone azo-B-naphthol dyestuff. of ethanolamine and add 5ml of absolute ethanol to reduce the viscosity the reagent is stable for several months.Ī 0.4% solution of the pure dye in methanol may last for about a month. Not recommended for titration of solutions more acidic than Ph 6.5.ĭissolve 0.2 g of the dyestuff in 15ml. Sodium 1-(1-hydroxy-2-naphthalyzo)-6-nitro-2-naphthol-4-sulphonate (1) also known as Solochrome Black T or WDFA or No. PH =11.6 - 13.0 color change = orange to violetĮriochrome Black T (metal-ion EDTA, also known as Solochrome black T or Mordant black) PH =0.0 - 3.0 color change = yellow to green fluorescence PH =1.4 - 2.4 color change = colorless to pink fluorescenceĭssolve 0.1g in 100ml 70 % ethanol, or 0.1g of the sodium salt in 100 ml water. PH =2.8 - 4.7 color change = colorless to yellowĭiphenylamine-4-sulfonic acid barium salt (redox)ĭiphenylamine-p-sulphonic acid (Na salt):ĭissolve 0.1g in 100 ml ethanol or iso-propyl alcohol. PH =4.0 - 5.8 color change = colorless to yellow N,N-Dimethyl-1.4-phenylenediammonium dichloride (redox)ĭissolve 0.05 to 0.1g. ![]() PH =2.9 - 4.0 color change = red to yellow-orangeģ.3'-Dimethylnahthidine(4.4'-Diamino-3.3-dimethyl-1.1'-binaphthaline)ĭissolve 1.0 g in 100 ml of glacial acetic acid (adsorption)ĝissolve 1g in 70 5 ethanol.ĭissolve 0.1 to 1.5 g. The indicator is coloured orange-yellow in strongly acid solutions, claret red in nearly neutral solutions and violet to blue in basic solutions.ĭissolve 0.1g of dichlorofluoroceinate in 100ml water.Ģ.6-Dichlorophenolin-dophenol sodiumsalt (dihydrate) (redox) PH =0.8 - 2.6 color change = yellow to blue-violetĭibromopyrogallol sulphone phthalein (VIII) (metal-ion EDTA) orĭissolve 0.05g of the reagent in 100ml. PH =1.2 - 2.8 color change = red to yellowĭissolve 0.1g. of 20% ethanol, or dissolve 0.04g in 1.05 ml of 0.1M sodium hydroxide and make up to 100 ml. PH =0.2 - 1.8 color change = red to yellowĭissolve 0.04g. PH =7.0 - 8.8 color change = yellow to purpleĭissolve 0.1g. of 50% ethanol, or dissolve 0.04g in 1.05 ml of 0.1M sodium hydroxide and make up to 100 ml. PH =7.4 - 9.0 color change = yellow to purpleĭissolve 0.1g. ![]() of 20% ethanol, or dissolve 0.04g in 0.86 ml of 0.1M sodium hydroxide and make up to 100 ml. PH =3.0 - 5.2 color change = blue to orange-yellowĭissolve 0.04g. PH =4.8 - 6.4 color change = yellow to purple The indicator is stable for at least 12 months when stored in a polythene bottle and in the dark. The colour change is from pink to pure blue.ġ-(1-hydroxy-4-methyl-2-phenylazo)-2-naphthol-4-sulphonic acid (IX) (metal-ion EDTA)Ĭan be substituted for Eriochrome Black T without change in the experimental procedures for calcium and magnesium.It has same colour change, which is clearer and sharper, and aqueous solutions of the indicator are almost stable indefinitely.ĭissolve 0.05g of calmagiite in 100ml. Sodium 1-(2- hydroxy-1-naphthylazo)-2-naphthol-4-sulphonate, Colour I ndex No.202 ĭissolve 0.2g of the dyestuff in 50ml. PH =5.7 - 7.5 color change = orange yellow to blueĬalcon also known as Solochrome Dark Blue or Eriochrome blue black R (metal-ion EDTA) PH =5.2 - 6.8 color change = orange yellow to purpleĭissolve 0.1g. of 20% ethanol, or dissolve 0.04g in 0.94 ml of 0.1M sodium hydroxide and make up to 100 ml. of 20% ethanol, or dissolve 0.04g in 0.6 ml of 0.1M sodium hydroxide and make up to 100 ml.ĭissolve 0.1g. PH =5.2 - 6.8 color change = yellow to purpleĭissolve 0.1g. of 20% ethanol, or dissolve 0.4g in 0.74 ml of 0.1M sodium hydroxide and make up to 100 ml. PH =3.8 - 5.4 color change = yellow to blueĭissolve 0.1g. of 20% ethanol, or dissolve 0.04g in 0.58 ml of 0.1Msodium hydroxide and make up to 100 ml with water. PH =3.0 - 4.6 color change = yellow to blue-violetĭissolve 0.1g. of 20% ethanol, or dissolve 0.04g in 0.69 ml of 0.1M sodium hydroxide and make up to 100 ml with water. PH =0.0 - 2.6 color change = yellow to greenĭissolve 0.1g. PH =9.4 - 14.0 color change = violet to pinkĭissolve 0.695 g of FeSO4.7H2O and 1.171 g of 2.2'-bipyridin in 100 ml of waterĭissolve 0.5 g in 100 ml of water or ethanol (96 %) PH =4.3 - 6.3 color change = yellow to violet water or in 100 ml 1:1 ethanol and water. ![]() PH =10.0 - 12.1 color change = light yellow to brownish yellowĭissolve 0.1g. PH =10.1 - 12.1 color change = red to purple |
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