Abstract
Summary The double layer capacity of a dropping mercury electrode in aqueous solutions of potassium hexafluorophosphate and potassium fluoride at 25°C and at constant ionic strength has been studied in order to investigate the adsorption of hexafluorophosphate ions and the possible involvement of fluoride specific adsorption in these systems. The discrepancies between measurements involving single salt solutions and those at constant ionic strength are noted and are explained in terms of fluoride adsorption. On the basis of experimental observations a simple model is proposed in terms of which the specifically adsorbed charge due to F − may be derived.
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