Question

Which of the following salts does not contain water of crystallization?
(a) Blue vitriol
(b) Baking soda
(c) Washing soda
(d) Gypsum

Answer 1

The chemical formula of the given chemical compounds are:
Baking soda: ${\text{NaHCO}}_3$
Blue vitriol: ${\text{CuSO}}_4.5{\text{H}}_2\text{O}$
Washing soda: ${\text{Na}}_2{\text{CO}}_3.10{\text{H}}_2\text{O}$ and
Gypsum: ${\text{CaSO}}_4.2{\text{H}}_2\text{O}$.

So, baking soda does not contain water of crystallization.