H-acid( 1-Amino-8-naphthol-3,6-disulfonic acid monosodium salt )

Structural formula:

Molecular formula: C10H8O7NS2Na
Molecular weight: 341.3
Main Uses: used to produce all kinds of azo dyes, used to dye wools, textiles, papers and paper textiles; also used to synthesize pharmaceutical.
Physical and Chemical Properties:

1.the solubility in water is 0.17% (20°C),the solubility in water is 2.40% (60°C), insoluble in alcohol and aether, soluble in solutions of alkali, sodium carbonate and ammonia;

2.the dilute solution of H-acid appears blue red fluorescence;

3.H-acid can couple in both acid and alkali condition;

4.the alkali solution of H-acid fast becomes dark in air. to produce yellow crystalline diazo compound when reacting with nitrous acid. diazo compounds are soluble in soda and alkali solution. appears light violet when dissolving in soda solution.appears dark green when dissolving in alkali solution;

5.assumes brown red color when reacting with ferric chloride,It is soluable in sodium carbonate solution and in red purple color;and it is dark green in salt solution.

Main Uses:?
mainly used in the production of acid dye,direct dye and reactive dye, used to produce all kinds of azo dyes, used to dye wools, textiles, papers and paper textiles; also used to synthesize pharmaceutical.