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Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid) , also called C.I. Acid Red 2, 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.ethyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid) , also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions.
Acid-base-indicators: A graphic view. A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the Arrhenius model.ence, a pH indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the Arrhenius model.