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在HCl In2 (SO4) 3 H2 O体系中 ,溶液表观总离子强度恒定为I=0 2、0 4、0 6、0 8、1 0、1 5mol·kg-1,硫酸铟在溶液中的表观离子强度分数恒定为yB =0 0 0、0 1 0、0 2 0、0 3 0、0 5 0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 2 78 1 5～ 3 1 8 1 5K温度范围内的电动势 :Pt,H2 (1 0 1 3 2 5kPa) |HCl(mA) ,In2 (SO4) 3 (mB) ,H2 O|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 ,HCl的活度系数服从扩展的Harned规则。
In the HCl In2 (SO4) 3 H 2 O system, the apparent total ionic strength of the solution was constant at I = 0 2,0 4,0 6,0 8,1 0,1 5 mol · kg -1 and indium sulfate in solution When the apparent ionic strength constant is constant at yB = 0 0 0,0 1 0,0 2 0,0 3 0,0 5 0 and 0 70, the classical electromotive force method is used to determine the absence of liquid junction cells (A) at 2 (1 0 1 3 2 5kPa) | HCl (mA), In 2 (SO 4) 3 (mB), H 2 O | AgCl Ag (A) Based on the electromotive force in the temperature range of 78 1 5 to 3 1 8 1 5K, The electromotive force data of battery (A) were measured. Taking into account the secondary dissociation of sulfuric acid in the system, a mathematical iteration method was used to determine the hydrogen ion concentration of the equilibrium system, and the activity coefficient of HCl in the mixed solution was determined. The results show that the activity coefficient of HCl obeys the extended Harned rule.