How many molecules of water of crystallisation (per formula unit) are present in :
(a) copper sulphate crystals ?
(b) washing soda ?
(c) gypsum ?
1. Copper Sulphate (CuSO4.5H2O ): 5 molecules of water of crystallization.
2. Washing soda (Na2CO3.10H2O ): 10 molecules of water of crystallization
3. Gypsum (CaSO4.2H2O): 2 molecules of water of crystallization