![]() 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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