Phenolsulfonphthalein

Description

Bright red crystalline powder. Phenolsulfonphthalein, or phenol red, is used as an acid base indicator. It is prepared as a 0.02-0.05% solution in ethanol. In solutions with a pH below pH 6.8, phenolsulfonphthalein is yellow and solutions above pH 8.4 are red.

Synonyms and Related Terms

phenol red; phenolsulfonephthalein; 4,4; -(3H-2,1-benzoxathiol-3-ylidene) bis-phenol, S,S-dioxide

Risks

• Inhalation, ingestion and contact may cause irritation.
• MilliporeSigma: SDS

Physical and Chemical Properties

Soluble in alkali hydroxides and carbonates. Slightly soluble in water, ethanol, acetone. Insoluble in chloroform, ether.

Composition	(C6H4OH)2COSO2C6H4
CAS	143-74-8
Molecular Weight	mol. wt. = 354.38