The adsorption of Cl- and Br- ions on the (001) plane of a bismuth single crystal electrode from solutions in 2-propanol has been investigated using differential capacity measurements. The ionic charge due to the specific adsorption has been calculated by the Hurwitz-Parsons-Dutkiewicz method. The results have been analysed on the basis of the virial adsorption isotherm. It has been found that the adsorption parameters for the (001) plane and the polycrystalline electrode do not differ significantly.