Question

what is water of crystallization ?

Answer 1

Answer:

crystallization is a fixed number of water molecules present in one formula unit of a salt five water molecules are present in one formula unit of copper sulphate.

Answer 2

Answer:

WATER OF CRYSTALLIZATION –

The water molecules which form a part of the structure of this salt is called the water of crystallization.

Some examples for water of crystallization :

➸ CuSO4•5H2O [Copper sulphate pentahydrate]

➸ Na2CO3•10H2O [Sodium carbonate decahydrate]

➸ CaSO4•2H2O [Calcium sulphate dihydrate]

➸ FeSO4•7H2O [Iron sulphate heptahydrate]

➸ CaSO4•½H2O [Calcium sulphate hemihydrate]

The salts which contain water of crystallization are called hydrous salts.

When hydrated salts are heated strongly, they lose the water of crystallization. Such salts are called anhydrous salts.

Example –

➸ CuSO4•5H2O —(∆)—> CuSO4 + 5H2O

The blue coloured hydrous salt converts into white coloured.

This is reversible process.

➸ CuSO4 + 5H2O —> CuSO4•5H2O