Answer:
The solubility of an ionic compound
depends on two factors: (i) lattice energy and (ii) hydration energy. These two
factors oppose each other. If lattice energy is high, the solubility is low. If
hydration energy is high, the ions will have greater tendency to be hydrated
and therefore, solubility will be high. The solubility of sulphates decreases
on moving down the group. \[BeS{{O}_{4}}\]and\[MgS{{O}_{4}}\] are soluble. This
is due to high energy of solvation of smaller \[B{{e}^{2+}}\] and \[M{{g}^{2+}}\]ions.\[CaS{{O}_{4}}\]is
sparingly soluble while \[SrS{{O}_{4}}\] and \[BaS{{O}_{4}}\] are almost
insoluble. This is due to high lattice energy values.
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