Question

Sodium sulphate is soluble in water but barium sulphate is sparingly soluble because:

• A. The hydration energy of $N{a}_{2}S{O}_4$ is more than its lattice energy
• B. The lattice energy of $BaS{O}_4$ is more than its hydration energy
• C. The lattice energy has no role to play in solubility
• D. The lattice energy of $N{a}_{2}S{O}_4$ is more than its hydration energy

Answer 1

Answer: (A), (B)

The correct options are
A The hydration energy of $N{a}_{2}S{O}_4$ is more than its lattice energy
B The lattice energy of $BaS{O}_4$ is more than its hydration energy

The energy released on hydration should be able to overcome the lattice energy and that is the basis for the solubility
of a salt.