电动势法确定水-丙酮-氯化钠-氯化镁体系热力学性质  

Determination of thermodynamic properties of NaCl-MgCl_2-H_2O-C_3 H_6O system by electromotive force method

作　　者：周丽华[1] 钱保华[1] 刘英红[1] 黄英[1] 黄静娴[1] 

机构地区：[1]淮海工学院化学工程学院,江苏连云港222005

出　　处：《化学工程》2011年第11期49-50,65,共3页Chemical Engineering(China)

基　　金：淮海工学院自然科学校内课题基金资助项目(Z2008025)

摘　　要：采用自行设计的无液体接界电池测定了多组分电解质在水溶液和混合溶剂中不同组成时电池的电动势。利用Pitzer模型拟合实验数据,获得电池的标准电动势E及电解质的活度系数。此外,计算了电解质从纯水到混合溶剂中的迁移吉布斯函数,求得了Pitzer模型的计算参数。获得了NaCl和MgCl2混合电解质的混合参数θ(NaCl)和ψ(NaMgCl)。通过电动势数据计算电解质在混合溶剂中的活度系数,结果表明:该多组分体系仍然遵守Harned规则。The thermodynamic properties of NaCl-MgCl2-H2O-C3H6O system were studied by electromotive force（EMF） method in the cell without liquid junction.The EMF reading was carried out at different molalities of NaCl and MgCl2 in H2O-C3H6O mixture at 298.15 K.The experimental data was fitted by Pitzer model.The standard electromotive force （EMF） of the cell and activity coefficient of electrolyte were obtained.The Gibbs function of transfer for the electrolyte from H2O to H2O-C3H6O mixture was calculated,and Pitzer parameters θ（NaCl） and ψ（NaMgCl） were determined.The results from the activity coefficient of electrolyte in mixed solvent show that the system obeys Harned rule.

关 键 词：热力学性质 活度系数 电动势法 HARNED规则 PITZER方程 

分 类 号：O646.23[理学—物理化学]