Description
Empirical Formula (Hill Notation): C20H14O4
General description
Phenolphthalein is an acid base indicator. It is a weak acid, which is colorless in acidic solution and turns puce pink in alkaline solution. Phenolphthalein is genotoxic. It might cause oxidative damage and binds to estrogen receptors.
Phenolphthalein solution is a synthetic indicator. It is colorless in acidic and neutral conditions. Phenolphthalein gives pink color when added to a base, therefore it is considered as a base indicator.
Application
Phenolphthalein solution has been used to measure total titratable acids by titration method.
PROPERTIES
form
liquid
concentration
0.5 wt. % in ethanol: water (1:1)
visual transition interval
8.0-10, colorless to red
mp
-35 °C
density
0.918 g/mL at 25 °C
λmax
552 nm
application(s)
diagnostic assay manufacturing
hematology
histology
storage temp.
room temp
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