Question

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

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

Answer 1

Answer: (A), (B)

The correct options are
A

The hydration enthalpy of $N{a}_{2}S{O}_4$ is more than its lattice enthalpy

B

The lattice enthalpy of $BaS{O}_4$ is more than its hydration enthalpy

If hydration enthalpy of a salt is greater than the lattice enthalpy then the salt is soluble.