Zinc sulfate is the inorganic compound with the formula ZnSO4 as well as any of three hydrates. It was historically known as "white vitriol". It is a colorless solid that is a common source of soluble zinc ions.

  • Formula: ZnSO4.7H2O
  • Density: 2.072 g/cm³
  • Molar mass: 287.53 g/mol
  • Classification: Sulfates


  • As a coagulant in the production of rayon
  • To supply zinc in animal feeds, fertilizers, and agricultural sprays
  • As in electrolytes for zinc plating
  • As a mordant in dyeing
  • As a preservative for skins and leather and in medicine


(ii) Matter insoluble in water per cent by weight, maximum 1.0
(iii) Zinc (as Zn) per cent by weight, minimum 21.0
(iv) Lead (as Pb) per cent by weight, maximum 0.003
(v) Copper (as Cu) per cent by weight, maximum 0.1
(vi) Magnesium (as Mg) per cent by weight, maximum 0.5
(vii) pH not less than 4.0
(viii) Sulphur (asS),percent by weight, minimum 10.0
(ix) Cadmium (as Cd), percent by weight, minimum 0.0025
(x) Arsenic (as As),percent by weight, minimum 0.01

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