English name: Methyl red; MR; CI 13020; Acid Red 2; 2- [4- (Dimethylamino) phenylazo] benzoic acid
Other names: methyl red; alkane red; methane red; p-dimethylaminoazobenzene carboxylic acid; acid red 2;
CAS number: 493-52-7
C15H15N3O2 = 269.30
Level: IND
pH discoloration range: 4.4 (red) ~ 6.2 (yellow)
Melting point: 181 ～ 182 ℃
Maximum absorption wavelength: 410nm
Properties: shiny purple crystal or reddish brown powder. Soluble in ethanol and acetic acid, almost insoluble in water. After the ethanol solution is stored for a long time, the sensitivity can be significantly reduced due to the esterification of the carboxyl group. Use: Biochemical research. Protozoa live staining; acid-base indicator. Titration of ammonia, weak organic bases and alkaloids, but not for organic acids other than oxalic acid and picric acid. It can be used as a mixed indicator with bromocresol green and methylene blue to shorten the color change domain and improve the sharpness of color change. Adsorption indicator for precipitation titration, such as titration of fluoride ion with thorium nitrate. Verification free chlorine, chlorite preservation: RT, protected from light
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