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Hofmeister Effects in pH Measurements: Role of Added Salt and Co-ions

Bostrom, Mathias; Craig, Vincent; Albion, Reanna; Williams, David; Ninham, Barry


Measurements of pH with a glass electrode that reveal a strong dependence on the ion pair of the background electrolyte and on the salt concentration are presented. Although such phenomena are well known, they are inexplicable in the classical theory based on the Nernst equation. It is shown that this (Hofmeister) effect can be understood once neglected ionic dispersion potentials acting between ions and the glass-water interface are taken into account. At high concentrations, those of interest...[Show more]

CollectionsANU Research Publications
Date published: 2003
Type: Journal article
Source: Journal of Physical Chemistry B
DOI: 10.1021/jp026804d


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