کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5413799 | 1393497 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the activity coefficients of charge-symmetrical ion pairs
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: On the activity coefficients of charge-symmetrical ion pairs On the activity coefficients of charge-symmetrical ion pairs](/preview/png/5413799.png)
چکیده انگلیسی
The association constant KA of charge-symmetrical ion pairs in electrolyte solutions, obtained from experiments yielding the fraction present as free ions as a function of the electrolyte concentration α(c), is calculated from KA = (1 â α)fip / α2cf±2. The activity coefficients of the free ions f± are generally taken into account but those of the ion pairs fip are commonly set equal to unity, for lack of better knowledge. Two methods for obtaining the latter quantity, one based on salting-out (in) and the other based on an analogy with zwitterions, are suggested for the calculation of fip. The consequences are illustrated for cases taken from the literature of ion pairing of thallium (I) chloride in water and of sodium iodide and tetrabutylammonium bromide in acetonitrile that are characterized by low or moderate values of KA, and of magnesium sulfate in water that has a fairly high value of KA.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 123, Issue 1, 15 January 2006, Pages 8-13
Journal: Journal of Molecular Liquids - Volume 123, Issue 1, 15 January 2006, Pages 8-13
نویسندگان
Yizhak Marcus,