Question

Account for the low stability of LiF and CsI in water.

Answer 1

Hey folk....

The both compounds which u stated are ionic but very less soluble in water, the reason can be stated on the basis of hydration energy and lattice energy, for solubility of a compound , it's hydration energy must be greater than lattice enthalpy.

In case of CsI both ions are very which results in less hydration of both ions in water.

BUT...

In case of LiF  though the ions are small and highly hydrated but it's lattice enthalpy exceeds it's hydration energy because of high charge density on both ions.

Thank you
HOPE IT HELPS..!