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  4. The right order of the solubility of sulphates of alkaline earth metals in water is

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Q. The right order of the solubility of sulphates of alkaline earth metals in water is

CMC MedicalCMC Medical 2007

Solution:

Be > Mg > Ca > Sr > Ba. The size of the $ SO_{4}^{2-} $ ion is very big (approx. 3 $ \overset{\text{o}}{\mathop{\text{A}}}\, $ ). Therefore, as the size of the cation increases, their hydration energies decrease more rapidly than their lattice energies. Consequently the solubilities of sulphates decrease down the group.