物理化学学报 >> 1998, Vol. 14 >> Issue (08): 691-697.doi: 10.3866/PKU.WHXB19980805

研究论文 上一篇    下一篇

RbCl在H2O-DMF混合溶剂中活度系数的测定

李林尉, 褚德萤, 刘瑞麟   

  1. 北京大学化学与分子工程学院，北京 100871|聊城师范学院化学系，聊城 252059
  • 收稿日期:1997-10-13 修回日期:1997-12-24 发布日期:1998-08-15
  • 通讯作者: 褚德萤

Determination of Activity Coefficients of RbCl in (H2O-DMF) Mixed Solvents at 283.15 to 318.15K

Li Lin-Wei, Chu De-Ying, Liu Rui-Lin   

  1. College of Chemistry and Molecular Engineering,Peking University,Beijing 100871|Department of Chemistry,Liaocheng Teacher's College,Liaocheng 252059
  • Received:1997-10-13 Revised:1997-12-24 Published:1998-08-15
  • Contact: Chu De-Ying

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摘要：

应用Corning-价阳离子选择电极（M＋－ISE）和Orion氯离子选择电极组成可逆电池，
CI－－ISE|RbCl（m），H2O（1－x），DMF（x）M+－ISE．
测量该电池标准电动势E?m，运用扩展的Debye－Huckel公式，计算RbCl在283.15至318.15K七个温度下由H2O至H2O－DMF混和溶剂的标准迁移自由能Δ?G和在不同组成（H2O－DMF）混合溶剂中平均离子活度系数γ±，并对迁移自由能及活度系数随混合溶剂有机物组份的摩尔分数的变化进行了讨论。

关键词: RbCl, H2O-DMF, 活度系数, 标准迁移自由能, 介质效应

Abstract:

 The reversible cell used in this work consists of the monovalent cation selective electrode and chloride selective electrode, namely
Cl--ISE|RbCl(m), H_2O(1- x)- DMF(x)| M+ - ISE
The standard electromotive forces of the above cells have been measured at seven temperatures ranging from 283.15 to 318.15 K, and standard free energies of transfer Gt of RbCl from H2O to H2O-DMF mixed solvents, mean ionic activity coefficients of RbCl in mixed solvents and its medium effects have been calculatcd. The behavior of Δ?Gt and of RbCl with mole fractions x of DMF in the mixed solvents have been discussed.

Key words: RbCl, H2O-DMF, Standard free energy of transfer, Activity coefficients, Medium effect