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When aqueous acetic acid is neutralised by aqueous KOH, the enthalpy of neutralisation will be

1. 57.2 kJ/mol
2. greater than 57.2 kJ/mol
3. less than 57.2 kJ/mol
4. Cannot be predicted

Correct answer: less than 57.2 kJ/mol

Solution

Because acetic acid is weak, some energy is consumed in ionising it before the H+ ions are neutralised by OH-. The net heat released is therefore less than the standard 57.2 kJ/mol observed for a strong acid-strong base reaction.

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