Question

Sodium sulphate is soluble in water whereas barlum sulphate is sparingly soluble because
(a) the hydration energy of $N{a}_{2}S{O}_4$ is less than its lattice energy
(b) the hydration energy of $N{a}_{2}S{O}_4$ is more than its lattice energy
(c) the lattice energy of $BaS{O}_4$ is more than its lattice energy.
(d) the lattice energy has no rolw to play in solubility.

• A. a & b
• B. b & c
• C. c & d
• D. b & d

Answer 1

Answer: (B)

b & c

• (a) Incorrect :For greater solubility, hydration energy must be greater than lattice energy.
• (b) Correct :For greater solubility, hydration energy must be greater than lattice energy.
  
• (c) Correct : Greater lattice energy discourage dissolution of a salt.
  
• (d) Incorrect : When a salt dissolve, energy is required to break the lattice, which comes from hydration process.