Question

Definition for hydration enthalpy

Answer 1

The Standard Enthalpy of Hydration, DH°hyd, 298, is the heat evolved when 1 mole of gaseous ions become hydrated (surrounded by water molecules), measured under standard conditions. The higher the charge on the ions and the smaller their size, the more exothermic the hydration enthalpy.
Enthalpy of hydration, Hhyd, of an ion is the amount of energy released when a mole of the ion dissolves in a large amount of water forming an infinite dilute solution in the process,
Mz+(g) + mH2O ® Mz+(aq)
where Mz+(aq) represents ions surrounded by water molecules and dispersed in the solution.
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