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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.
3 + group to produce-NH 2 NO + and water; a second water is eliminated to produce the-N 2 + group. 3) 2 group: Vocabulary. azo compound diazonium salt diazotization indicator pH strong acid titration weak base. Chemists use methyl orange as an indicator in the titration of weak bases with strong acids.It changes from red (at pH 3.1) to orange-yellow (at pH 4.4):ere is the structure of methyl orange in acidic solution: Methyl orange in acidic solution.Click the image for a 3D Chime structure.