Where does “Enthalpies of Hydration and ionization” come in the chemistry textbook in thrmodynamics ? I checked. But, couldn’t find.

dear anna 
you can find out the concept of enthalpy of hydration in the thermodynamics and equilibrium chapter , 
its a multi concept topuc and it will use in thermodynamics and equilibrium calculation ques . 
HOPE IT CLEARS , 
REGARDS