Question

what do you mean by hydration enthalpy

Answer 1

Hydration energy (also hydration enthalpy) is the amount of energy released when one mole of ions undergo hydration which is a special case of solvation. It is a special case of dissolution energy, with the solvent being water.

Answer 2

hydration enthalpy is the amount of energy released when one mole of ions undergo hydration which is a special case of solvation