摘要
我们已用钾离子敏感膜电极和银—氯化银电极组成无液界电池,通过测量其电动势的方法测定了25℃时恒定离子强度(I=0.1,0.3,0.5和0.7)条件下,KCl—K_2SO_4水溶液中KCl的平均质量摩尔浓度活度系数。结果表明,KCl的平均活度系数的对数与混合溶液中每个电解质的离子强度分量,在该条件下服从哈内特线性关系。已用最小二乘法计算了相应的哈内特系数。在相应恒离子强度(I=0.1,0.3,0.5和0.7)条件下,其值分别为0.0430,0.0356,0.0329和0.0320。
We have determined the mean molal activity coefficients r± of KCL in KCL-K2SO4 aqueous solutions of constant strength (I = 0. 1, 0. 3, 0. 5 and 0.7) at 25℃ by measuring the e.m.f. of cells, which consist of a K+ ion sensitive membrane electrode and an Ag-AgCL electrode without liquid junctions. The results show that the logarithm of the the r± of KCL in these mixtures of constant total ionic strength is directly proportional to the ionic strength fraction of each electrolyte component. The respective Harneds coefficients aA have been computed by the least squares method. Its values at I = 0. 1, 0. 3, 0. 5and 0. 7, equal 0. 434, 0 .121, 0. 0647 and 0. 0457 , respectively.
