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Explain water of crystallisation.

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Many salts are found as crystals with water molecules they contain. These water molecules are known as water of crystallisation. Salts that contain water of crystallisation are called ‘ hydrated salts. The number of molecules of water hydrated to a salt is indicated after the dot in its chemical formula. For example, copper sulphate crystal have five molecules of water for each molecule of copper sulphate. It is written as CuSO4 .5H2O and named as copper sulphate pentahydrate. This water of crystallisation makes the copper sulphate blue.

When it is heated, it loses its water molecules and becomes white. Salts that do not contain water of crystallisation is called anhydrous salt.

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