Why are BeSO_{4} and MgSO_{4} readily soluble in water while CaSO_{4}, SrSO_{4} andBaSO_{4} are insoluble?

Answers (1)

The solubility of sulphates of group 2 elements depend on their hydration energy which decreases down the group. The lattice energy of group 2 sulphates is almost the same. Very high hydration enthalpy of  Be^{2+} and Mg^{2+}  ions overcome the lattice enthalpy and their sulphates are soluble. However 

In other elements of group 2 the hydration enthalpy is not high enough to overcome lattice enthalpy. So, they remain insoluble in water.

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