Ionization of water in concentrated potassium halide media
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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.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Chemical and Mathematical Science|
|Publisher:||Commonwealth Scientific and Industrial Research Organization Publishing|
|Copyright:||© CSIRO 2000.|
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