Question

Sodium sulphate is solution is water whereas barium sulphate is sparingly soluble because:

• A. the hydration energy of solution sulphate is more than its lattice energy.
• B. the lattice energy of barium sulphate is more than its hydration energy.
• C. the lattice energy has no role to play in solubility.
• D. the hydration energy of sodium sulphate is less than its lattice energy.

Answer 1

The correct option is A the hydration energy of solution sulphate is more than its lattice energy.

1. Option A is correct: For greater solubility, hydration energy must be greater than lattice energy.
   
2. Option B is incorrect: Greater lattice energy discourage dissolution of a salt.
   
3. Option C is incorrect: When a salt dissolve, energy is required to break the lattice, which comes from hydration process.
   
4. Option D is incorrect: As for same reason explained in (A).