ChemistryAcids, Bases and Salts

Water of Crystallisation

Heat hydrated salts and track the water lost.

Salt

Mass taken25 g

Water lost on heating

9.02g

Residue

15.98g

Observation

Blue → white anhydrous CuSO₄

Water of crystallisation driven off on heatingexothermic

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Water of crystallisation is the fixed number of water molecules present in one formula unit of a salt.

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