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Acetic acid and hydrochloric acid react ...

Acetic acid and hydrochloric acid react with KOH solution. The enthalpy of neutralization of acetic acid is`-55.8 kJ mol^(-1)` while that of hydrochloric acid is `-57.3 kJ 'mol^(-1) .` Why?

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It is because .HC l. is strong acid, it ionises completely in aqueous solution whereas acetic acid is weak acid which does not ionise completely and some energy is used in its complete ionisation.
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