The standard enthalpy change of neutralization is the enthalpy change when solutions of an acid and an alkali react together under standard conditions to produce 1 mole of water.
HCl is a strong acid, and CH3COOH is a weak acid. During a reaction with a strong base, the weak acid is forced to completely dissociate (there is no weak acid molecule left intact at the equivalence point).
Since it completely dissociates, you might think the ∆Hrxn would be the same as the strong acid HCl.
However, the accepted value for the ∆Hrxn for CH3COOH is about 1.9 kJ/mol less than for the HCl.
Explain why this is so.
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