The enthalpy of neutralisation of a weak acid is less than that of a strong acid. The difference of the latter from the former is known as enthalpy of ionisation of the weak acid.
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The enthalpy of neutralization of a weak acid is less than that of a strong acid.
The difference of the latter from the former is known as enthalpy of ionization of the weak acid.
For example, the enthalpy of neutralization of HCl with NaOH is -13.7 kcal whereas the enthalpy of neutralization of HCN with NaOH is -2.9 kcal.
The difference 10.8 kcal is the heat of ionization of HCN.

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