THERMODYNAMIC PROPERTIES FOR SODIUM BROMIDE-METHANOL-WATER SYSTEM AT 298.15K BY E.M.F. MEASUREMENTS

潘焕泉; 韩世钧; 姚燕

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THERMODYNAMIC PROPERTIES FOR SODIUM BROMIDE-METHANOL-WATER SYSTEM AT 298.15K BY E.M.F. MEASUREMENTS

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- THERMODYNAMIC PROPERTIES FOR SODIUM BROMIDE-METHANOL-WATER SYSTEM AT 298.15K BY E.M.F. MEASUREMENTS
- CIESC Journal Issue 3, (1992)
- 作者机构：
  
  浙江大学化学系,浙江大学化学系,中国科学院盐湖研究所杭州310027,,西宁,杭州,310027
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 June 1992，
  
  Published：25 June 1992
- 稿件说明：
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潘焕泉, 韩世钧, 姚燕. THERMODYNAMIC PROPERTIES FOR SODIUM BROMIDE-METHANOL-WATER SYSTEM AT 298.15K BY E.M.F. MEASUREMENTS[J]. CIESC Journal, 1992, (3).
DOI：

潘焕泉, 韩世钧, 姚燕. THERMODYNAMIC PROPERTIES FOR SODIUM BROMIDE-METHANOL-WATER SYSTEM AT 298.15K BY E.M.F. MEASUREMENTS[J]. CIESC Journal, 1992, (3). DOI：

摘要

用Na离子选择性电极NaBr(m)

MeOH(w)

H_2O(100-w)Br离子选择性电极组成的电池测定NaBr在甲醇含量为0%、10%、20%、40%、60%、80%、90%和100%的甲醇-水混合溶剂

浓度在0.01～3.0mol/kg之间的平衡电势.用Pitzer方程关联实验结果得到每个实验点的NaBr的平均活度系数.结果发现

在一定的溶剂比例下

NaBr的平均活度系数先随它的浓度增加而下降

然后上升;当NaBr浓度固定时

它的平均活度系数随溶剂中甲醇含量增加而下降.NaBr在甲醇中有微弱的缔合.

Abstract

Electromotive force measurements of the cell Na ion-selective elec-trode(glass) |NaBr(m)

MeOH(w)

H2O(100-w)|Br ion-selective electrode (solid state)were made at molalities of NaBr ranging from 0.01 to 3.0 in the mixed solvent of methanol-water containing 0

and 100 weight% methanol

respectively

at 298. 15K. Calculations of standard cell potential were made by using the Pitzer equation

and then the mean activity coefficient values of NaBr were evaluated. The association constant of NaBr in methanol were evaluated from the experimental E. M. F. data by using the Pitzer-Simonson equation extended to the binary systems containing ion pairing. The weak association of NaBr in methanol was shown. At each fixed solvent composition

the mean activity coefficients of NaBr first decreased and then increased with rising NaBr molality. At each fixed NaBr molality

they decreased with an increase of methanol in solvent mixtures.

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