盐酸在硫酸镉水溶液中热力学性质的研究  

Thermodynamics Properties of HCl in Cadmium Sulfate Solutions

作　　者：张春丽[1] 王琴萍[2] 陈树森[2] 邢长宇[2] 吕殿祯[2] 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳110168 [2]辽宁大学化学系,辽宁沈阳110036

出　　处：《稀有金属》2006年第1期74-77,共4页Chinese Journal of Rare Metals

基　　金：辽宁省自然科学基金(9810300902)资助项目

摘　　要：在HCI-CdSO4-H2O体系中，恒定溶液总离子强度为I=0．2，0．4，0．6，0．8，1．0，1．5mol·kg^-1，CdSO4在溶液中的离子强度分数恒定为yB=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在278．15～318．15K温度范围内的电动势。由于体系中存在硫酸的二级解离，应用数学迭代方法确定平衡体系中氢离子的浓度，AgCl-Ag电极的标准电极电势应用Bates方法确定，根据测得电池的电动势数据计算了混合溶液中HCI的活度系数γA。结果表明，在溶液中总离子强度保持恒定时，HCI的活度系数服从Hamed规则，混合物中HCI的活度系数lgγA对热力学温度γ作图是一条直线。The thermodynamic properties of HCI- CdS04 system were studied by the emf measurement in the cell without liquid junction at constant total ionic strength I = 0. 2, 0. 4, 0. 6, 0. 8, 1. 0, 1. 5 mol·kg^-1 and yB=0.00, 0.10, 0.20, 0.30, 0.50, 0.70 at different temperatures from 278.15 to 318.15 K. Because of secondary dissociation of sulfuric acid in the system, the concentrations of hydrogen ions in equilibrium system were determined by mathematic iterative technique. The standard electrode of AgCl-Ag in the pure water was determined according to the method of Bates. The activity coefficients of HCI lgγA in of HCI-CdSO4 system were determined from cell （A）. The results show that the activity coefficients of HCI in the solutions still obey Harned＇s rule and lgγA is a linear function of the absolute temperature at constant composition of the mixture.

关 键 词：盐酸 热力学性质 活度系数 CdSO4 HARNED规则 

分 类 号：O646.23[理学—物理化学]