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Updated: Mar 22, 2026

Determination of the Gas-phase Acidities of Oligopeptides
Published on: June 24, 2013
Acidity of Strong Acids in Water and Dimethyl Sulfoxide
Aleksander Trummal1, Lauri Lipping2, Ivari Kaljurand2
1National Institute of Chemical Physics and Biophysics , 23 Akadeemia tee, Tallinn 12618, Estonia.
Abstract:
Careful analysis and comparison of the available acidity data of HCl, HBr, HI, HClO4, and CF3SO3H in water, dimethyl sulfoxide (DMSO), and gas-phase has been carried out. The data include experimental and computational pKa and gas-phase acidity data from the literature, as well as high-level computations using different approaches (including the W1 theory) carried out in this work. As a result of the analysis, for every acid in every medium, a recommended acidity value is presented. In some cases, the currently accepted pKa values were revised by more than 10 orders of magnitude.
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