The solubility of sulfates in water decreases | vedclass

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Question

(A) The solubility of alkaline earth metal sulfates decreases down the group. This is primarily because the hydration enthalpy of the metal ions decre

Vedclass · Accepted Answer

High hydration enthalpy of small ions like $Be^{2+}$.

Vedclass · Answer

(A) The solubility of alkaline earth metal sulfates decreases down the group. This is primarily because the hydration enthalpy of the metal ions decreases significantly from $Be^{2+}$ to $Ba^{2+}$ as the ionic size increases. Since the sulfate ion is large,the lattice energy does not decrease as rapidly as the hydration enthalpy,leading to a decrease in overall solubility.

The solubility of sulfates in water decreases down the group for $Be$ to $Ba$. The correct order is $BeSO_4 > MgSO_4 > CaSO_4 > SrSO_4 > BaSO_4$. The reason for this is:

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