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词汇 Methyl red test
分类 英语词汇 英语翻译词典
释义

Methyl red test

英语百科

Methyl red

Color transition of methyl red solution under different acid-base conditions. Left: acidic, middle: about pH 5.1 (the pKa), right: alkaline

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.

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