Question

The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions.
Amongst fluorides of alkali metals, the lowest solubility of $LiF$ in water is due to:

• A. Ionic nature of lithium fluorides
• B. High lattice enthalpy
• C. High hydration enthalpy of lithium ion
• D. Low ionisation enthalpy of lithium atom

Answer 1

The correct option is B High lattice enthalpy

Due to strong packing of $L{i}^{+}$ and $F^{-}$ ions, lattice energy of $LiF$ is higher than its hydration energy. That is why $LiF$ is least soluble in water.