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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. (heat of reaction; H_2 O = -55.84 KJ/mole)

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