The solubility of alkaline earth metal sulphates in water follows the trend . Which thermodynamic fa — s Block Elements Chemistry Question

💡 Solution & Explanation

For large polyatomic anions like $SO_4^{2-}$, the lattice energy is dominated by the anion and remains relatively constant down the group. However, the hydration enthalpy drops sharply as the cation size increases from $Be^{2+}$ to $Ba^{2+}$. Thus, hydration energy overcomes lattice energy only for $Be$ and $Mg$.