混合电解质NaBr+NaAc十H_2O体系的活度系数的测定

CIESC Journal

混合电解质NaBr+NaAc十H_2O体系的活度系数的测定

闫卫东,刘卫东,韩世钧,尤笑梅

浙江大学化学系,浙江大学化学系,浙江大学化学系,浙江大学化学系杭州310027 ,杭州310027 ,杭州310027 ,杭州310027

出版日期:1993-12-25 发布日期:1993-12-25

ACTIVITY COEFFICIENTS IN MIXED - ELECTROLYTE SOLUTION OF NaBr - NaAc - H_2O SYSTEM

Yan Weidong, Liu Weidong, Han Shijun and You Xiaomei (Department of Chemistry, Zhejiang University, Hangzhou 310027)

Online:1993-12-25 Published:1993-12-25

摘要/Abstract

摘要： 用电势法测定了298.15K以及I为0.1、0.5、1.0、1.5、2.0、2.5和3.0 mol/kg时,NaBr在混合电解质溶液NaBr+NaAc+H_2O中的活度系数.实验结果用Harned、SRJ和Pitzer方程拟合,得到各种方程的相互作用参数,由拟合的标准偏差得知,Pitzer方程的拟合精度略好于前2个方程.用Pitzer混合参数θ_(Br-Ac)和ψ_(Br-Na-Ac)计算了NaAc在该混合体系中的活度系数和体系的过量Gibbs自由能.

Abstract: The activity coefficients of NaBr in the system NaBr - NaAc - H_2O at 298. 15K were determined from EMF measurements at constant total ionic strengths of 0. 1, 0. 5, 1. 0, 1. 5, 2. 0, 2. 5 and 3. 0 mol/kg. At each total ionic strength studied the measurements were carried out at different ratios of the NaAc to NaBr ionic strengths. The experimental activity coefficients were fitted by using the Harned equation, Scatchard equation and Pitzer equation. Although all these models can be successfully applied to the analysis of this system, the Pitzer equation leads to better fitting than the others. Finally, the excess Gibbs free energy of these mixtures was also calculated.

闫卫东,刘卫东,韩世钧,尤笑梅. 混合电解质NaBr+NaAc十H_2O体系的活度系数的测定 [J]. CIESC Journal.

Yan Weidong, Liu Weidong, Han Shijun and You Xiaomei (Department of Chemistry, Zhejiang University, Hangzhou 310027). ACTIVITY COEFFICIENTS IN MIXED - ELECTROLYTE SOLUTION OF NaBr - NaAc - H_2O SYSTEM[J]. .