Phenolsulfonphthalein
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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 |