Cresol purple
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Description
A purplish crystalline powder used as an acid-base indicator. Cresol purple changes from red to yellow over a pH range of 1.2 -1.8 and changes again from yellow to purple from pH 7.4 - 9.0.
Synonyms and Related Terms
meta-cresolsulfonphthalein; m-cresol purple; púrpura de m-cresol (Esp.); porpora cresolo (It.)
Risks
- Inhalation, ingestion and contact may cause irritation and redness.
- ThermoFisher: SDS
Physical and Chemical Properties
Soluble in ethanol, water, dilute acid and dilute alkalis.
| Composition | C21H18O5S |
|---|---|
| CAS | 2303-01-7 |
| Molecular Weight | mol. wt. = 382.44 |
Resources and Citations
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
- Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C21H18O5S, CAS= 2303-01-7