Methyl orange / orange yellow Ⅲ / Golden Lotus orange D / acid orange 52 / hemianthin B

English name：Methyl orange；Orange Ⅲ；Gold orange；Helianthine B ；Tropaeolin D；Sodium p-dimethyl-aminoazobenzene sulfonate；C.I.13025

Other names: Jinlian orange D; Sodium p-dimethylaminoazobenzene sulfonate; 4 - [[4 - (dimethylamino) phenyl] azo] sodium benzenesulfonate; Acid orange 52; Hemianthin B

CAS No.: 547-58-0

C14H14N3NaO3S=327.33

Grade: ind

PH discoloration range: 3.0 (red) ～ 4.4 (yellow)

Water insoluble matter: ≤ 0.15%

Burning residue: 18.5 ～ 22.0%

Physicochemical properties: orange yellow powder or flake crystal. 1 part is dissolved in 500 parts of water, easily soluble in hot water, the solution is golden yellow, almost insoluble in ethanol. The maximum absorption wavelength is 505nm.

Purpose: biochemical research. Acid base indicator. Determine the alkalinity of most mineral acids, strong alkalis and water. Volumetric determination of tin (SN # 2 + discolors methyl orange when hot). Strong reducing agents (Ti3 +, CR2 +) and strong oxidizing agents (chlorine, bromine) are decolorizing indicators. Spectrophotometric Determination of chlorine, bromine and bromine ions. It can be mixed with indigo sodium disulfonate or bromocresol green to shorten the color gamut and improve the sharpness of color change. Redox indicator, such as trivalent arsenic or antimony for potassium bromate titration.

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