Chlorophenol red
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Description
A brown solid that is used as an acid-base indicator. In solution, chlorophenol red is yellow at pH 5.2 and changes to violet at pH 6.8. It is used in some types of pH indicator pens, such as Lineco.
Synonyms and Related Terms
Chlorphenolrot (Deut.); chlorphenol red; dichlorophenolsulfonephthalein
Risks
- Inhalation, ingestion and skin contact may cause irritation.
- Fisher Scientific: MSDS
Physical and Chemical Properties
Slightly soluble in water.
| Composition | C19H12Cl2O5S |
|---|---|
| CAS | 4430-20-0 |
| Molecular Weight | mol. wt. = 423.07 |
Resources and Citations
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- Conservation termlist: www.hants.org.uk/museums
- Aldrich Chemical Catalog
- Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C19H12Cl2O5S, CAS= 4430-20-0