Question

$\Delta$ x is given by: $\Delta$x = (hydration energy) - (lattice energy). For a salt, $\Delta$x is found to be 500 k cal mol${}^{-1}$. Then on increasing the temperature, its solubility in water

• A. increases
• B. decreases
• C. remains same
• D. increases initially and then decreases

Answer 1

The correct option is B decreases

$\Delta H_{Solution}=$ Lattice Energy - hydration energy
So, $\Delta H_{Solution}$ is - ve for given process
When $\Delta H_{Solution}$ is - ve solubility decreases with increase in temperature