Abstract
Abstract The specific adsorption of bromide ions on a mercury electrode from lithium bromide solutions of dimethyl sulfoxide (DMSO) has been studied through the measurement of the differential capacity and the interfacial tension. The capacity data showed the evidence that anions are more weakly, but cations are more strongly, solvated by DMSO molecules than by H2O. The amounts of specifically adsorbed bromide ions are greater than those values in water at the same electrode charge. The specific adsorption of cations (Li+) was not found in this study. The inner layer capacity due to the amounts of specific adsorbed anions was calculated, and the ratio of the distances from the metal to the inner Helmholtz plane and to the outer Helmholtz plane were deduced. These values are comparable to those for LiCl in DMSO, but are greater than for water.
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