Zinc Sulphate BP
Abstract
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.
Use/Application
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.
Identity
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. |
| Identification
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.
Other
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We observe WHO Good manufacturing practice and Good laboratory practice.
