A compound containing half molecule of water of crystallisation on mixing with water changes to hard solid mass having two molecule of water of identify the compounds and write the reaction
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Water of crystallization or the water of hydration is the water that occurs in the crystals. It is denoted as hydrated compound nH
2
O. For example, gypsum is a soft mass having the formula CaSO
4
.2H
2
O. On heating gypsum, plaster of paris is formed by losing the water of crystallization. Plaster of paris is a hard mass with the formula CaSO
4
.
2
1
H
2
O.
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