Abstract
Pitzer's equation for the activity coefficient has been applied to LiCl, NaCl, KCl, RbCl, CsCl, and HCl in methanol-water mixtures at 25°C. The two parameters, β MX (0) and β MX (1) , were obtained by the method of least squares. The same values of b and α as for aqueous systems could be used for the methanol-water mixtures without greatly affecting the standard deviation of the fit. β MX (0) was found to decrease with methanol content for the alkali metal chlorides whereas β MX (1) was found to increase. For HCl, however, a slight maximum and a minimum were found in the values of β MX (0) while a maximum was observed in the values of β MX (1) .
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