1. Tardigrade
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  3. Chemistry
  4. The enthalpy of neutralization of NaOH with acetic acid is 55 kJ and with HCl is 57.1 kJ . This happens because:

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Q. The enthalpy of neutralization of $ NaOH $ with acetic acid is $55 \,kJ$ and with $ HCl $ is $ 57.1\,kJ $ . This happens because:

J & K CETJ & K CET 2001

Solution:

The enthalpy of neutralization of weak acid with strong base is always lesser than the strong acid with strong base. Hence, the enthalpy of neutralization of $NaOH$ with $CH _{3} COOH$ is $55 \,kJ$ and with $HCl$ is $57.1 \,kJ$. 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., $CH _{3} COOH$.