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  • Why are BeSO_4 and MgSO_4 readily soluble in water while CaSO_4, SrSO_4 and BaSO_4 are insoluble?

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

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The solubility of sulphates of group 2 elements depends on their hydration energy, which decreases down the group. The lattice energy of group 2 sulphates is almost the same. The very high hydration enthalpy of  Be^{2+} and Mg^{2+}  ions overcomes the lattice enthalpy, and their sulphates are soluble. However, in other elements of Group 2, the hydration enthalpy is not high enough to overcome the lattice enthalpy. So, they remain insoluble in water.

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