Question

What are hydrated salts and unhydrated salts ?

Answer 1

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A hydrated salt is a crystalline salt molecule that is loosely attached to a certain number of water molecules. Salt is created when an acid’s anion and a base’s cation are combined to produce an acid-base molecule.
 A salt molecule that is not bound to any water molecules is an anhydrate, and a salt molecule that is bound to water molecules is a hydrated salt. In a hydrated salt, the water molecules are incorporated into the crystalline structure of the salt.
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Answer 2

Salts those contain water of crystallisation attached to their molecules are called hydrated salts. For example, Na2CO3.10H2O.
Salts those don't contain water of crystallisation attached to their molecules are known as unhydrated salts. For example, NaCl.
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