在HCl-CoSO4-H2O体系中,恒定溶液总离子强度I分别为0.2、0.4、0.6、0.8、1.0、1.5 mol/kg,CoSO4在溶液中的离子强度分数yB分别恒定为0.00、0.10、0.20、0.30、0.50和0.70条件下,应用经典的电动势方法测定无液体接界电池(A)在278.15~323.15 K温度范围内的电动势为:Pt,H2(105Pa)| HCl(cA),CoSO4(cB),H2O | AgCl-Ag (A)根据测得电池(A)的电动势数据,考虑到该体系存在硫酸的二级解离,应用数学迭代方法确定平衡体系氢离子的浓度,进而确定了混合溶液中HCl的活度系数γA.结果表明,在溶液中总离子强度保持恒定时,HCl的活度系数服从Harned规则.在溶液组成恒定时,log γA对热力学温度1/T作图,是一条直线.
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