کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9694209 | 1459642 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enthalpy of mixing of univalent electrolyte solutions at different ionic strengths at 308.15Â K in aqua-DMF mixed solvent system
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Excess enthalpies of mixing for six possible binary combinations of solutions of NaCl, KCl, NaBr and KBr have been determined as a function of ionic strength. The experiments were performed at constant ionic strengths of 1.000 and 2.000 mol kgâ1 at 308.15 K using flow micro calorimeter in water + N,N-dimethylformamide mixed solvent system. Data do not support Young's cross square rule. Pitzer's ion interaction model has been utilized to obtain binary and triplet interaction parameters i.e. ÎH and ÏH. The data were also analyzed in the light of Friedman model and it is suggested that interactions between solvated ions are dictated not only by coulombic interactions but also by appreciable asymmetric effects. The deviation from Young's cross square rule is considered to arise from significant contribution of triplet interactions and preferential solvation of the ions and ion-clusters, due to incorporation of organic co-solvent in the solvation shell.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 427, Issues 1â2, March 2005, Pages 101-107
Journal: Thermochimica Acta - Volume 427, Issues 1â2, March 2005, Pages 101-107
نویسندگان
B.R. Deshwal, S. Maken, H.K. Lee, K.C. Singh,