Question

what is hydrated salt?

Answer 1

The molecules of water which combine chemically with the molecule of a salt are called the water of crystallization.For example, each molecule of washing soda contains 10 molecules of water of crystallization.

Anhydrous Salts

       The salts which don’t contain water molecules are known as anhydrous salts. For example, if we heat the crystals of copper sulphate then the five molecules of water will evaporate, and the remaining salt without water will be called as anhydrous salt having formula CuSO4.

Strong acids:

CuSO4.5H2O            CuSO4     +     5H20

Anhydrous copper
        Sulphate

Answer 2

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Hydrate, any compound containing water in the form of H2O molecules, usually, but not always, with a definite content of water by weight. ... The best-known hydrates are crystalline solids that lose their fundamental structures upon removal of the bound water.