Question

Some salts while crystallizing out from their solution, unite with a definite quantity of water which is known as: ________

Answer 1

Water of crystallization:-

1. This basically refers to the crystalline salt molecules that are loosely attached to a certain number of the water molecules which is known as hydration of salt.
2. Actually, these water molecules are incorporated with the crystal structure of the salt and these water molecules are then known as the water of crystallization.
3. This water of crystallization is basically in the chemical combination with the salts which can be driven out by the heating of the powdered crystals of the salts above the temperature of $100°\mathrm{C}$.
4. Example: Washing soda$({\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O})$

Therefore, Some salts while crystallizing out from their solution, unite with a definite quantity of water which is known as: ‘Water of crystallization’