| Abstract: | Measurements have been made of two-cationic cell potentials and cation interchange fluxes for the exchange between K+, Na+, Li+ and H+ across a polystyrenesulfonic acid ion-exchange membrane separating solutions of hydrochloric acid and the univalent chloride salts of varied composition. The experimental data have been used to estimate the magnitudes of ionic mobility ratios, membrane ionic concentrations, “effective” single-ion diffusion and interdiffusion coefficients of the interchanging cations in the membrane corresponding to various time intervals during a normal integral cation interchange process. The results indicate that during cation interchange the “effective” single-ion diffusion coefficients of the counterdiffusing cations in the membrane vary markedly over ranges of up to 80% of equilibrium of the interchange processes investigated. |
