Thermodynamic study of the ternary aqueous mixed electrolyte system [(1-y)MgCl2 + yKCl] by electromotive force measurements

被引：11

作者：

Ghalami-Choobar, Bahram ^{[1
]}

Arvand, Majid ^{[1
]}

Moghimi, Majid ^{[1
]}

Bagherinia, Mohammad A. ^{[1
]}

机构：

[1] Univ Guilan, Fac Sci, Dept Chem, Rasht, Iran

来源：

PHYSICS AND CHEMISTRY OF LIQUIDS | 2009年 / 47卷 / 05期

关键词：

activity coefficients; Pitzer model; emf; sol-gel electrode; MgCl2; KCl; ACTIVITY-COEFFICIENTS; SOLVENTS; NH4CL; WATER;

D O I：

10.1080/00319100802620546

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The activity coefficients for magnesium chloride in the MgCl2 + KCl + H2O ternary system were determined from electromotive force measurements as a function of total ionic strength and composition of the mixture. In this work, emf measurements were performed on the galvanic cell without liquid junction of the type: Ag|AgCl|MgCl2 (m(1)), KCl (m(2)), H2O|Mg-ISE, at the temperature 298K and over total ionic-strengths from 0.015 to 6 mol kg(-1) for different series of salt molal ratios. The sol-gel-based magnesium ion selective electrode (SG-ISE) and Ag/AgCl electrode used in this work were prepared in our laboratory. The Pitzer model was used for the experimental results correlation of activity coefficients. The unknown Pitzer mixing interaction parameters were evaluated (theta(MgK) = 0.1249, psi(MgKCl) = -0.0572). Then, these parameters were used to predict the thermodynamic properties for the systems under investigation as a function of total ionic strength.

引用

页码：553 / 563

页数：11

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