WATER OF CRYSTALLIZATION
When any salt is evaporated, some water molecules remain attached with +ve and –ve ion of salt present in the crystal of salt. These water- molecules are called “Water of crystallization” while the salt is called “hydrate salt”. When any hydrated salt is heated at very high temperature it become anhydrated salt. E.g.
Na2CO3 .10H2O ————-> Na2CO3 +10H2O