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CAS Number: 493-52- 7
Linear Formula: (CH3)2NC6H4N=NC6H4CO2H
Molecular Weight: 269.30
Synonyms: 2-(4- Dimethylaminophenylazo)benzoic acid, 4-Dimethylaminoazobenzene-2′- carboxylic acid, Acid Red 2
Methyl Red is an indicator dye that turns red in acidic solutions. It is an azo dye, and is a dark red crystalline powder. Methyl red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between, with a pKa of 5.1.