Calconcarboxylic acid/3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-2-carboxylic acid
Item No.： SR0225
Store at： RT
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
