Abstract
When an ion exchange membrane separates two electrolyte solutions, an electric potential is set up. In the particular case where the two solutions contain the same co-ion and different counter-ions at the same concentration, Co, this potential is named the bi-ionic potential (BIP). The ion interdiffusion fluxes transform every bi-ionic system to a multi-ionic one. We have set up an experimental device which permits us to obtain reliable measurements of BIPs. A cation exchange membrane (CM 2) has been used to study the BIP as a function of C 0. The comparison of experimental results with the Helfferich equations shows that the former is only confirmed at high or low concentrations. The important role of diffusion layers, co-ion flux and/or influence of membrane structure are proved.
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