Why are BeSO4 and MgSO4 readily

Question:

Why are BeSO4 and MgSO4 readily soluble in water while CaSO4, SrSO4 and BaSO4 are insoluble?

Solution:

BeSO4 and MgSO4 are readily soluble in water, CaSO4, SrSO4, and BaSO4 are insoluble. This is because the greater hydration enthalpies of Be2+ and Mg2+ ions

overcome the lattice enthalpy factor and therefore their sulphate is soluble in water.

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