物理化学学报 >> 1991, Vol. 7 >> Issue (01): 57-63.doi: 10.3866/PKU.WHXB19910109

研究论文 上一篇    下一篇

三元体系Na2SO4-CuSO4-H2O 25 ℃活度系数的研究

姚燕; Atkinson, G.   

  1. 中国科学院青海盐湖研究所; University of Oklahoma; Norman OK 73019, USA
  • 收稿日期:1989-08-31 修回日期:1990-05-03 发布日期:1991-02-15
  • 通讯作者: 姚燕

Thermodynamics of Electrolyte Mixtures Activity Coefficients in Aqueous Na2SO4-CuSO4 at 25 ℃

Yao Yan; Atkinson, G.   

  1. Qinghai Institute of Salt Lakes, Academia Sinica, Xining, Qinghai; Department of Chemistry, University of Oklahoma, Norman, OK73019 USA
  • Received:1989-08-31 Revised:1990-05-03 Published:1991-02-15
  • Contact: Yao Yan

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摘要： 用自制的Hg-Hg_2SO_4电极和Na离子选择性电极, 在25 ℃和离子强度分别为1.0和2.0的条件下, 测定了Na_2SO_4在Na_2SO_4和CuSO_4混合水溶液中的平均活度系数。对所使用的电极组的热力学响应、重现性等性能进行了检验。根据文献提供的Pitzer方程, 推导了计算Na_2SO_-CuSO_4-H_2O体系中Na_2SO_4和CuSO_4平均活度系数的表达式, 求出了Pitzer混合参数和Harned方程系数, 计算了CuSO_4在该体系中的平均活度系数。

关键词: 三元体系Na2SO4-CuSO4-H2O, 离子强度, 活度系数, Na离子选择电极, 电动势法

Abstract: In previous reports the ternary system Na_2SO_4-CuSO_4-H_2O was investigated by osmotic coefficient and solubility work. This paper reports the determenations of the mean activity coefficients of Na_2SO_4 in the ternary system at 25 ℃ and ionic strength 1.0 and 2.0 by emf method using a Na sensitive glass electrode vs. Hg-Hg_2SO_4 electrodes.
The Hg-Hg_2SO_4 electrodes were prepared in our laboratory and performance tests for the electrode pair were carried out. Linear near-Nernst response and good reproducibility and stability were observed.
Pitzer's recent equations were used to derived...

Key words: Ternary system Na2SO4-CuSO4-H2O, Ionic strength, Activity coefficients, Na Sensityve electrode, emf method