Chlorophenol red

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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.

Chemical structure

Chlorophenol red.jpg

Synonyms and Related Terms

Chlorphenolrot (Deut.); chlorphenol red; dichlorophenolsulfonephthalein


  • 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:
  • Aldrich Chemical Catalog
  • Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: OMNIC: formula= C19H12Cl2O5S, CAS= 4430-20-0

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