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

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CBSE | Chemistry | Class 11 | NCERT Exemplar | The s-Block Elements

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

Answer:

CaSO4, SrSO4, and BaSO4 are insoluble in water, whereas BeSO4 and MgSO4 are readily soluble in water. This is because to the higher hydration enthalpies of the Be2+ and Mg2+ ions, which allow them to overcome the lattice enthalpy factor, resulting in their sulphate being soluble in water.