Description

H Acid(*-Amino**-hydroxynaphthalene*3,*-disulphonic acid)
 
CAS: ******0
Molecular Formula: C*0H8O7NS2Na
Molecular Weight/Mass: **1.3

Application: for the manufacture of azo dye, for dying wool, paper and cotton, may also be used for synthesis of pharmaceutical.
 

Physical and Chemical Properties:

(1)the solubility in water is 0.*7% (*0°C);
(2)the solubility in water is 2.*0% (*0C°C);
(3)insoluble in alcohol and aether;
(4)soluble in solutions of alkali, sodium carbonate and ammonia;
(5)the dilute solution of H-acid appears blue red fluorescence;
(6)H-acid can couple in both acid and alkali condition;
(7)a. the alkali solution of H-acid fast becomes dark in air; b. to produce yellow crystalline diazo compound when reacting with nitrous acid; c. diazo compounds are soluble in soda and alkali solution; d. appears light violet when dissolving in soda solution, e. appears dark green when dissolving in alkali solution.