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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