The correct order of the solubility of sulpha | vedclass

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Question

(C) The correct answer is $(C)$. The solubility order is $BeSO_4 > MgSO_4 > CaSO_4 > SrSO_4 > BaSO_4$. As we move down the group from $Be$ to $Ba$,the

Vedclass · Accepted Answer

$Be > Mg > Ca > Sr > Ba$

Vedclass · Answer

(C) The correct answer is $(C)$. The solubility order is $BeSO_4 > MgSO_4 > CaSO_4 > SrSO_4 > BaSO_4$. As we move down the group from $Be$ to $Ba$,the size of the cation increases. The lattice energy remains almost constant because the sulphate ion is very large compared to the cations,so the change in cation size has a negligible effect on the lattice energy. However,the hydration energy decreases significantly from $Be^{2+}$ to $Ba^{2+}$ due to the increase in ionic radius. Since hydration energy is the driving force for solubility,the decrease in hydration energy leads to a decrease in the solubility of sulphates down the group.

The correct order of the solubility of sulphates of alkaline earth metals in water is

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