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Enthalpy of a reaction or energy change of a reaction D H, is the amount of energy or heat absorbed in a reaction. If the energy is required, D H is positive, and if energy is released, the D H, is negative.
By definition, the enthalpy of hydration, #Î´_hydH#, is the enthalpy change that takes place when 1 mol of gaseous ion is dissolved in excess water to make one mole of aqueous ion. Significance of hydration enthalpy. It gives an indication of the strength of the interaction of water molecules with the ions.