Question

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

• A. the hydration energy of sodium 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 play in solubility
• D. the hydration energy of sodium sulphate is less than its lattice energy

Answer 1

Answer: (A), (B)

The correct options are
A the hydration energy of sodium sulphate is more than its lattice energy
B the lattice energy of barium sulphate is more than its hydration energy

Concept involved:
1. When the hydration energy is more than the lattice energy, the salt is soluble in water.
2. When the hydration energy is less than the lattice energy, the salt is soluble in water.Hence hydration energy is converted to lattice energy to become soluble(for ionisation)
Hence options A, B are correct.