Phenolphthalein diphosphate tetrasodium salt is a phenolphthalein (P318010) derivative used as a diagnostic compound for the determination of phosphatase, such as in sour milk cheese. It is also used as an acid-base indicator. General Properties and Specifications of Phenolphthalein Diphosphate Tetrasodium...
Acidity or alkalinity: Dissolve 1.0 g in ethanol (96 per cent) and dilute to 10 mL with the same solvent. Add 0.1 ;mL of phenolphthalein solution. The solution is colourless. Not more than 0.5 mL of 0.01 M sodium hydroxide is required to change the colour of the indicator to pink. Op...
ASSAY: Weigh accurately a conical flask with a ground-glass stopper containing 25 mL of water R. Add 1.0 mL of the substance to be examined and weigh again accurately. Add 0.5 mL of phenolphthalein solution R and titrate with 1 M sodium hydroxide. 1 mL of 1 M sodium hydroxide is equival...
Acidity or alkalinity: To 10 mL of solution S add 10 mL of carbon dioxide-free water. To 10 mL of this solution add 0.05 mL of phenolphthalein solution. Not more than 0.2 mL of 0.01 M sodium hydroxide is required to change the colour of the indicator to pink. To a further 10 mL of...
Analysis: Introduce the Sample into a suitable separator, add 30 mL of boiling water, and shake vigorously for about 1 min. Allow to cool, and draw off the separated water. To 10 mL of the filtrated aqueous layer add 0.1 mL of phenolphthalein. ...