Chemistry - Salt Analysis Question with Solution | TestHub

The correct order of solubility of sulphates in water is ${\mathrm{BeSO}}_4>{\mathrm{MgSO}}_4>{\mathrm{CaSO}}_4>{\mathrm{SrSO}}_4>{\mathrm{BaSO}}_4$ Solublity of 2nd group sulphates decreases as we down the group due to less release of hydration energy. ${\mathrm{Be}}^{2+}<{\mathrm{Mg}}^{2+}<{\mathrm{Ca}}^{2+}<{\mathrm{Sr}}^{2+}<{\mathrm{Ba}}^{24}$ (lonic Size) As hydration energy decreases more rapidly than latice energy, the solubility decreases down the group. Hydration Energy $=\frac{\text{ Charge }}{\text{ Size }}$ While lathice energy almost remains constant. Hence, solubility decreases.