The potential at the surface of a central ion, from which the limiting laws of electrolyte solutions are found, is derived by a method which is simple, rigorous, and valid for a wide class of possible laws governing the dependence of the ion distribution on the potential. This class is characterized by two properties, both very simple and which can very reasonably be expected to be possessed by the actual distribution law, whatever it may be. In particular, the Boltzmann distribution law is not assumed, although of course it is included in the class considered.
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