Sodium Carbonate Anhydrous BP

Test

Limit

Assay                                              

99.5 % -100.5%

Solubility

Freely Soluble in water, practically insoluble in ethanol (96 %).

Appearance of solution (20 % w/v solution)

Solution is clear and not more intensely colored than reference color solution Y6

Identification

(A) By Color

A: 10 % solution is strongly alkaline.

(B) Reaction Of carbonates  

B:  It gives reaction of Carbonate   

(C) Reaction of Sodium

C:  It gives reaction of Sodium.

(D) LOD

D: It complies with limit test of Loss   on drying

Alkali hydroxides and bicarbonate

The solution does not become red and after 2-minute boil the solution, the solution remains clear.

Loss on Drying at 300 C

1% Max

Heavy metals

NMT 50 ppm

Sulphate

NMT 250 ppm

Chloride

NMT 125 ppm

Iron

NMT 50 ppm

Arsenic 

Not more than 5 ppm