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本文用无液接电势电池：Ｎａ－ＩＳＥ（或Ｋ－ＩＳＥ）｜（ＮａＣｌ（ｍＡ），ＫＣｌ（ｍＢ），Ｈ２Ｏ｜Ｃｌ－ＩＳＥ同时测定了２９８．１５Ｋ，溶液离子强度Ｉ：０．１、０．５、１．０、１．５、２．０和２．５ｍｏｌ／ｋｇ时，钠电极与氯电极组成的电池和钾电极与氯电极组成的电池的可逆电势值，根据Ｎｅｒｎｓｔ方程分别求出ＮａＣｌ－ＫＣｌ－Ｈ２Ｏ体系中，ＮａＣｌ和ＫＣｌ的平均活度系数。用Ｐｉｔｚｅｒ方程拟合两套实验数据，求出两套基本一致的Ｐｉｔｚｅｒ混合参数θＮａ－Ｋ和。将混合参数代回Ｐｉｔｚｅｒ方程，分别求出另一组分的平均活度系数，计算值与实验值比较，标准偏差分别为：０．００８１（ＮａＣｌ）和０．００７３（ＫＣｌ）。
In this paper, we measured the ionic strength of solution I: 0.1 at 298.15K using Na-ISE (or K-ISE) | (NaCl (mA), KCl (mB) 0.5,1.0,1.5,2.0 and 2.5mol / kg, the sodium electrode and the chlorine electrode composed of a battery and a potassium electrode and a chlorine electrode composed of a battery reversible potential value, respectively, according to Nernst equation The average activity coefficients of NaCl and KCl in NaCl-KCl-H2O system were obtained.The Pitzer equation was used to fit two sets of experimental data and two sets of Pitzer mixing parameters θNa-K were obtained. The mixing parameters were substituted into the Pitzer equation The average activity coefficients of the other components were calculated. The calculated values were compared with the experimental values. The standard deviations were 0.0081 (NaCl) and 0.0073 (KCl), respectively.