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Zinc Sulfate 7-Hydrate, ZnSO4 • 7H2O, Zinc sulfate heptahydrate, Zinc vitriol, White vitriol
The powder and crystals
Minerals; Inorganic; Zinc-Group
History and authority: Allen: Encyclopedia Materia Medica, Vol. X, 221; Clarke: A Dictionary of practical Materia Medica, Vol. III, 1605.
Description of the substance
Zinc sulfate exists as different hydrates. The physical properties differ according to these different types of aggregation.Zinc sulfate heptahydrate forms from saturated watery zinc sulfate solutions into colorless, shiny, column formed crystals. Above 39°C it transforms into the hexahydrate (ZnSO4 · 6H2O) and at 70°C-100°C we only find monohydrate (ZnSO4 · H2O). The last crystal water molecule vanishes at 240°C (anhydrate).
Zinc sulfate exists in nature as a mineral, we find it as heptahydrate in the mountain region of Harz (Germany) as Goslarit and as anhydrate in Spain (Zinkosit).
Zinc sulfate heptahydrate:
Zinc sulfate is a very water soluble, transparent, colorless or white to grayish-white or yellowish, crystalline compound. It appears as crystals, granules. or crystalline powder. It is commonly used as the heptahydrate. It can be prepared by reacting zinc with sulfuric acid.
The substance is soluble in water, insoluble in alcohol and is not combustible.
Molecular mass: 287.56. Boiling Point: > 500°C. Density: 1.97 g/cm3. Solubility in water, g/100 ml at 20°C: 54. pH: ca. 4.5 as aqueous solution
Inappropriate storage leads to decomposition: Oxides of sulfur and oxides of zinc form. It reacts with water to form sulfuric acid.