Zinc Sulphate BP

Zinc Sulphate also known as white vitriol is an inorganic compound that occurs in anhydrous, monohydrate, hexahydrate and heptahydrate forms. It has the formula ZnSO4 as well as any of three hydrates. It was historically known as “white vitriol”. All of the various forms are colorless solids. The heptahydrate form is commonly encountered.


The hydrates, especially the heptahydrate, are the primary forms used commercially. The main application is as a coagulant in the production of rayon. It is also a precursor to the pigment lithopone. It is also used to supply zinc in animal feeds, fertilizers and agricultural sprays, to control moss growth on roofs, as an electrolyte for zinc plating, as a mordant in dyeing, as a preservative for skins and leather and in medicine as an astringent and emetic.


Chemical Name: Zinc Sulphate Heptahydrate
Mol. Formula: ZnSO4.7H2O
Mol. Weight: 287.56 g/mol
CAS No: 7446-20-0


General Specifications

Test Specification
Characters It occurs as a white or almost white, crystalline powder or colorless, transparent crystals, efflorescent.

Test A

Test B

Test C


a)Solution gives the reactions of sulfates

b) Solution gives the reactions of zinc

c) It complies with the limits of the assay.

Solubility Very soluble in water, practically insoluble in alcohol.
Appearance of Solution Solution is clear and colorless
pH 4.4 to 5.6
Chlorides Not more than 300ppm
Iron Not more than 100 ppm
Assay Not less than 99.0% and not more than 104.0%


Shelf life, Storage and Packing

It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.


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We observe WHO Good manufacturing practice and Good laboratory practice.

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