Calculation of the anion-solvent equilibrium on the electrode surface from our earlier model of the electrode/electrolyte interface requires the Gibbs energy and the mean dipole moment of the adsorbed solvent molecules. These data can be taken from other theories or from experimental results. The second manner is presented. A dipole component of the potential drop across the inner layer, the Gibbs energy and the mean dipole moment of water molecules adsorbed on the Hg electrode are determined from the capacity data of Hg in aqueous 0.1 N NaF solution at 289.15 K. These data were used to calculate the surface concentration of anions and the differential capacity of the interface. Influence of bulk electrolyte concentration, energy of specific anion interactions and anion diameter on the anion adsorption and differential capacity are also discussed.