For the aqueous database, pKb values were converted into pKa values using the method of Bandura and Lvov (Bandura, A. V., and S. N. Lvov, "The Ionization Constant of Water over a Wide Range of Temperatures and Densities." J. Phys. Chem. Ref. Data, Vol. 35, 2006, pp. 15 - 30). See also the "Release on the Ionization Constant of H2O" from The International Association for the Properties of Water and Steam.
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