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Answer to Question #51211 in Physical Chemistry for JUGNU

Question #51211
Define enthalpy of neutralisation. Why is its value constant for strong acid-strong base
neutralisation? Why is its value different if a weak acid is used in place of the strong acid
Expert's answer
The enthalpy of neutralisation is the change in enthalpy that occurs when an acid and base undergo a neutralisation reaction to form one mole of water in natural states. Its value is constant for strong acid-strong base neutralisation because this reaction is just the reaction between OH- and H+ to make the water. If a weak acid is used in place of the strong acid the change of enthalpy will be different because weak acid does not fully dissociate and it requires energy.

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