A Simple Method for the Evaluation of Enthalpy of Proton Dissociation in Water

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<jats:title>Abstract</jats:title> <jats:p>A method is proposed for evaluating the ΔH° value for the proton dissociation of an acid HB from the temperature dependence of the dissociation constant Ka: Instead of differentiating the pKa (= −log Ka) value of acid HB with respect to temperature, we select an appropriate acid HA as a reference and plot the quantity X = pKa(HB)−pKa(HA) as a function of reciprocal temperature. The plot was found to be linear with sufficient accuracy for most non-charged or negatively charged acids, for which pKa itself is a complex function of temperature. ΔH° values are thus readily evaluated by linear least-squares fitting. The theoretical background is discussed.</jats:p>

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