Ferrous Sulfate Heptahydrate

MOLECULAR FORMULA  :-   FeSO4.7H2O

MOLECULAR WEIGHT :- 278.02 g/mol

SPECIFICATION IP BP USP
Description Bluish green crystals or a light green, crystalline powder, odourless.Efforescent in air. On exposure To moist air, the crystals rapidly oxidize and become brown. Bluish green crystals or a light green, crystalline powder,efforescent in air. Bluish green crystals or a light green, crystalline powder, odourless.Efforescent in air.
Solubility Freely soluble in water, very soluble in boiling water, practically insoluble in ethanol (96 %) Ferrous sulfate heptahydrate is oxidized in moist air, becoming brown.
pH 3.0-4.0 ( 5 % w/v Solution) 3.0-4.0
Appearance of Solution The solution is not more opalescent than opalescent Standard.
Identification

(A)   Reaction

(B)   Reaction

(C)   Assay

A.   It gives reaction of sulfates

B.   It gives reaction of Ferrous Salt

A.   It gives reaction of sulfates

B.    It gives reaction of Irons

C.   It complies with limit of assay.

A.   It gives reaction of sulfates

B.   It gives reaction of Ferrous Salt

Chloride NMT 250 ppm NMT 200 ppm
Basic sulphate Producing solution that is not more than turbid.
Arsenic NMT 2 ppm NMT 3 ppm
Lead NMT 50 ppm NMT 10 ppm
Mercury It meets the requirements of the test for mercury
Chromium NMT 50 ppm
Copper NMT 50 ppm NMT 50 ppm
Ferric ions NMT 0.5 % NMT 0.3 %
Manganese NMT 0.1 % NMT 0.1 %
Nickel NMT 50 ppm
Zinc NMT 500 ppm NMT 50 ppm
Organic volatile impurities Meets the requirements.
Residual Solvents Meets the requirements.
Assay     98.0 %  – 105.0 % 98.0 %  – 105.0 % 99.5%  -104.5 %