o-Cresolphthalein

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o-Cresolphthalein
O-Kresolphthalein.svg
Names
IUPAC name
3,3-Bis(4-hydroxy-3-methylphenyl)-1(3H)-isobenzofuranone
Identifiers
5-18-04-00193
ChemSpider
ECHA InfoCard 100.008.985
Properties
C22H18O4
Molar mass 346.38 g·mol−1
Appearance White powder
Melting point 223 °C (433 °F; 496 K)
Insoluble
Solubility Soluble in ethanol
Acidity (pKa) 9.61
Hazards
S-phrases (outdated) S22-S24/25
Related compounds
Related compounds
Phenolphthalein
Thymolphthalein
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

o-Cresolphthalein is a pH indicator used in titrations. It is insoluble in water but soluble in ethanol. Its solution is colourless below pH 8.2, and purple above 9.8.

Cresolphthalein (pH indicator)
below pH 8.2 above pH 9.8
8.2 9.8

References[edit]