O-Cresolphthaleino-Cresolphthalein is a phthalein dye used as a pH indicator in titrations. It is insoluble in water but soluble in ethanol. Its solution is colourless below pH 8.2, and purple above 9.8. Read from the Chembox of the Wikipedia article O-Cresolphthalein, revision 1380041009.

Property

Value

Formula

C22H18O4, 346.38 g/mol

Melting point

223 °C

Boiling point

222.6 °C

log P, measured

1.975

pKa

9.61

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