A) some heat is required for complete ionisation of acetic acid
B) acetic acid is an organic acid
C) acetic acid is less soluble in water
D) acetic acid is a weak acid and required lesser alkali
Correct Answer: A
Solution :
The enthalpy of neutralization of weak acid with strong base is always lesser than the strong acid with strong base. Therefore, the enthalpy of neutralisation of \[NaOH\] with \[C{{H}_{3}}COOH\] is \[55\text{ }KJ\]and with \[HCl\] is\[57.1\text{ }KJ\]. This is due to that weak acid is not completely dissociated. Hence, some of heat is utilised for complete ionisation of weak acid. i.e. \[C{{H}_{3}}COOH\].
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