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Mayer's expressions for the ionic activity coefficient and osmotic pressure of an electrolyte solution are shown to involve known and accurately tabulated functions. Mayer's infinite series of integrals is summed to give a single integral involving the Debye-Huckel potential of average force. With the help of the new form, the use of the single cut-off parameter for binary electrolytes is discussed from a quantitative standpoint.
Emmanuel Meeron (Mon,) studied this question.