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Heat of neutralisation of a weak acid HA...

Heat of neutralisation of a weak acid HA by `NaOH` is `-"12.13 kJ mol"^(-1)`. Calculate the enthalpy of ionization of HA. The Heat of neutralisation of a strong acid with strong base is `-"54.9 kJ mol"^(-1)`

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`DeltaH_("ionisation")^(sigma)=+"42.77 kJ mol"^(-1)`.
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