Calconcarboxylic acid/3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid

English Name: calconcarboxylic acid; 3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid

Other names: calcium carboxylic acid indicator; Calcium red; Calcium sodium carboxylate; Calcium carboxylic acid; Calcium reagent sodium carboxylate; 3-hydroxy-4 - [(2-hydroxy-4-sulfo-1-naphthyl) azo] - 2-naphthalenecarboxylic acid; 2-hydroxy-1 - (2-hydroxy-4-sulfo-1-naphthylazo) - 3-naphthoic acid; Calcium reagent carboxylic acid; 3-hydroxy-4 - (2-hydroxy-4-sulfo-1-naphthylazo) naphthalene-2-carboxylic acid; 1 - (2-hydroxy-4-sulfo-1-naphthylazo) - 2-hydroxy-3-naphthoic acid

CAS No.: 3737-95-9

C21H14N2O7S=438.41

Grade: ind

Dissolution test of dilute sodium hydroxide solution: acceptable

Complexation test: acceptable

Titration test: acceptable

Burning residue (calculated by sulfate): ≤ 0.3%

 Physicochemical properties : Brown to black crystal or brown powder. It is easily soluble in alkali liquor and ammonia water and slightly soluble in water. It is red when pH is not more than 10, and light blue between pH 13 and 14. It can form a red chelate with calcium. Melting point 300 ℃. The maximum absorption wavelength is 560 (366) nm. Irritating. Commodities are also made into sodium salt, which is easily soluble in water, and the aqueous solution and ethanol solution are unstable. It is often used after mixing with 100 times sodium chloride

Purpose: biochemical research. Complexation indicator, determination of calcium

Saving: RT