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Ionization of water in concentrated potassium halide media

Samani, F.K., Capewell, S.G., Sipos, P., May, P.M. and Hefter, G. (2000) Ionization of water in concentrated potassium halide media. Australian Journal of Chemistry, 53 (5). pp. 369-373.

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The ionic product of water, pKw = -log[H+][OH-], has been determined as a function of ionic strength (7) in concentrated aqueous solutions of KCl, KBr and Kl at 25°C by high-precision glass electrode potentiometric titrations. The pKw values obtained are in excellent agreement with, but generally more precise than, literature data. At I > 1 M the pKw values increase smoothly and show systematic differences in the order KCl < KBr < Kl, consistent with the decreasing H+-acceptor ability of the medium anions. Analogous behaviour is observed in MCl solutions, with pKw values varying in the order NaCl < KCl < CsCl. Formation constants of MOH0 ion pairs derived from these data are consistent with literature values.

Item Type: Journal Article
Murdoch Affiliation(s): School of Chemical and Mathematical Science
Publisher: Commonwealth Scientific and Industrial Research Organization Publishing
Copyright: © CSIRO 2000.
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