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Calculation of liquid junction potentials for equilibrium studies

Hefter, G.T. (1982) Calculation of liquid junction potentials for equilibrium studies. Analytical Chemistry, 54 (14). pp. 2518-2524.

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A detailed consideration of the assumptions underlying the Henderson equation indicates that, contrary to widely held views, the calculation of liquid junction potentials via this equation is rellable under certain well-defined conditions. In particular this is shown to be true for the constant lonic strength liquid junctions commonly used in equilibrium studies. The validity of the potentials calculated from the Henderson equation is demonstrated directly by comparison of the calculated potentials with “experimental” values and indirectly from equilibrium constant determinations. The latter indicate that accurate thermodynamic information can be obtained even In the presence of quite large liquid junction potentials. Some of the limitations and possible applications of the Henderson equation approach are briefly discussed.

Item Type: Journal Article
Publisher: American Chemical Society
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