Orange IV / No. 4 Orange / acid yellow D / acid No. 4 Orange / Golden Lotus orange OO

English name：Orange IV；Diphenylamine orange；Acid yellow D；Resorcin yellow OO；Tropaeolin OO；Sodium(potassium) p-diphenylaminoazobenzenesulf

Other names: No. 4 orange;  Acid yellow D; Acid orange No. 4; Jinlian orange OO; Golden orange IV; Diphenylamine yellow; 4 - [[4 - (phenylamino) phenyl] azo] benzenesulfonic acid monosodium salt; Sodium diphenylazobenzene sulfonate; Acid orange IV

CAS No.: 554-73-4

C18H14N3NaO3S=375.38

Grade: ind

PH discoloration range: 1.4 (red) ～ 3.2 (yellow)

Loss on drying: ≤ 4.5%

Water dissolution test: acceptable

Burning residue: 20.0 ～ 22.5%

Physicochemical properties: orange yellow flake crystal or yellow powder. Soluble in water and ethanol solution, yellow

Purpose: biochemical research. Acid base indicator. Indicator for non-aqueous solution titration to analyze calcium and magnesium. A mixed indicator was formed with the complex indicator chrome black T to improve the sensitivity of the latter to color change

Saving: RT