Give suitable chemical term for
A definite number of water molecules bound to some salts?

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Solution

Water of crystallization.
Some salts while crystallizing out from their solutions, unite with a definite quantity of water, which is known as the water of crystallization.
Certain salts are crystalline due to the presence of a definite number of water molecules loosely attached to the molecules of the salt.
On heating such salts lose the attached water molecules are called water of crystallization.
Example: Blue Vitriol(Copper sulphate CuSO₄.5H₂O)
Blue vitriol is obtained by the action of sulphuric acid on the oxide, hydroxide of Copper.
CuO (s) + H₂SO₄(aq) ⇢ CuSO₄ (aq) + H₂O(aq)
Cu(OH)₂ (s) + H₂SO₄ (aq) ⇢ CuSO₄.2H₂O(aq)
On evaporation of aqueous Copper sulphate crystals of CuSO₄.5H₂O (Blue vitriol)obtained.

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