The number of water molecules, which enter in a loose chemical combination with one molecule of a substance is called _______________.

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Solution

The fixed amount of water that is associated with hydrated crystals which is an integral part of the crystal is known as the water of crystallization.
Example- ${CuSO}_{4} . 5 H_{2} O$
The structure of hydrated Copper sulphate has copper sulphate molecules combined with 5 molecules of water through a very weak force.
The number of water molecules, which enter in a loose chemical combination with one molecule of a substance is called water of crystallization.

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