Question

What is meant by 'hydrated' and 'anhydrous' salt?
Explain with example

Answer 1

Hydrated salt:

A compound with one or more chemically combined water molecule

Example: Copper sulphate pentahydrate (CuSO4.5H2O)

Anhydrous salt:

A compound in which all water molecules are removed is called Anhydrous salt.

Example: Heating of Copper sulphate pentahydrate (CuSO4.5H2O) produce anhydrous copper sulphate(CuSO4­)

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Answer 2

Hydrated means with water or surrondded by water. For eg: Nacl (aq)

where aq denotes aquoes which is hydrated. Anhydrous means in solid phase. For Eg: Nacl( s)

where s denotes solid.