Debye-Hückel理论中电解质活度系数的对数与离子强度平方根的直线关系只适用于极稀的溶液,对稍浓的溶液并不适用.很早已有人找出,某些溶液的logf±与C~(1/3)呈线性关系.Robinson等指出在浓度0.001到0.05m范围内,1ogf±与C~(1/3)可绘成直线.Frank等也证明在C>0.001m时logf±与C~(1/3)的线性关系适用于很广的范围,并提出电解质 The linear relationship between logarithm of electrolyte activity coefficient and square root of ionic strength in Debye-Hückel’s theory applies only to very dilute solutions, not to slightly concentrated solutions.It has long been found that the logf ± and C ~ (1/3) .Robinson et al pointed out that in the range of 0.001 to 0.05m, 1ogf ± and C ~ (1/3) can be drawn in a straight line.Frank et al also proved that when C> 0.001m logf ± and The linear relationship of C ~ (1/3) is suitable for a wide range and proposes electrolytes