Methyl Red

Methyl Red (pH indicator)
below pH 4.4 above pH 6.2
red">4.4 6.2

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.

Murexide and methyl red are investigated as promising enhancers of sonochemical destruction of chlorinated hydrocarbon pollutants.

Methyl red is classed by the IARC in group 3 - unclassified as to carcinogenic potential in humans.

Read more about Methyl RedPreparation, Methyl Red Test

Other articles related to "methyl red, red":

Methyl Red Test - Expected Results
... At this pH, methyl red turns red ... A red color represents a positive test ... At this pH, methyl red is yellow ...
IMVi C - Methyl Red and Voges–Proskauer Test
... the broth is separated into two different tubes, one for the methyl red (MR) test and one for the Voges-Proskauer (VP) test ... The pH indicator Methyl Red is added to one tube and a red color appears at pH's lower than 4.2, and indicated positive test ...

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