What is the number of water molecules present in a Ferrous Sulphate cr

What is the number of water molecules present in a Ferrous Sulphate crystal ?

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UPSC NDA-2 – 2021

Ferrous Sulphate commonly exists as a hydrated salt known as green vitriol. The chemical formula for this hydrated form is FeSO₄·7H₂O. This indicates that each formula unit of ferrous sulphate is associated with 7 molecules of water of crystallization.

– Ferrous Sulphate forms hydrated crystals.
– The most common hydrate is the heptahydrate (FeSO₄·7H₂O).

Other less common hydrates of ferrous sulphate also exist, such as the monohydrate (FeSO₄·H₂O) and tetrahydrate (FeSO₄·4H₂O). However, unless otherwise specified, ferrous sulphate crystals usually refer to the heptahydrate.

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