METAL DISPLACEMENT REACTIONS.

A unified treatment of metal displacement reactions has been described that includes the contributions of activity coefficients and the effect of finite phase size. The numerical technique is versatile, accurate and capable of treating the widest variety of displacement reactions yet described in the literature. Where comparision may be made, the earlier analytic results of Wagner and Werner (6) are identical with the results reported here. As in the earlier treatment, the interfacial concentrations are constant, but the present extension permits the calculation of profiles for finite size systems where the concentrations at the interface change with time. The effect of activity coefficient corrections are small for the systems treated here, but may not be for mixed valent electrolytes.