Abstract

Summary The capacity of the double layer at a mercury electrode in contact with aqueous KBr solutions was measured at 25°. These results, together with those for other halides, are used to investigate the relation between electrocapillary and capacity measurements. Under most conditions there is no disagreement, but errors can occur in electrocapillary measurements on a positively charged surface in dilute solutions of weakly-adsorbed electrolytes, possibly due to the occurence of a finite contact angle. To obtain accurate surface excesses it is important to make measurements at closely spaced concentrations. The adsorption isotherm of Br − , in common with several other anions, exhibits features which do not seem to be explicable in terms of current theory. The question of specific adsorption of F − is briefly discussed.

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