Which of the following salts does not contain water of crystallisation?
(A) Blue vitriol
(B) Baking soda
(C) Washing soda
(D) Gypsum
Answer
Water of crystallisation is the amount of water molecules present in a unit of salt
From the given options, let’s check out their formula
- Blue vitriol i.e. CuSO 4 .5H 2 O has 5 water of crystallization
- Baking soda i.e. NaHCO 3 has no water of crystallisation
- Washing soda i.e. Na 2 CO 3 .10H 2 O has 10 water of crystallization
- Gypsum i.e. CaSO 4 .2H 2 O has 2 water of crystallisation
Among the following options, only baking soda does not contain water of crystallisation
So, the correct option is
(b) Baking soda