By H. L. Friedman, C. V. Krishnan (auth.), Felix Franks (eds.)

The chapters making up this quantity had initially been deliberate to shape a part of a unmarried quantity protecting sturdy hydrates and aqueous ideas of straightforward molecules and ions. besides the fact that, through the practise of the manu­ scripts it grew to become obvious that this kind of quantity may turn into very unwieldy and that i reluctantly determined to suggest the ebook of sepa­ expense volumes. the main good means of dividing the subject material appeared to lie within the separation of easy ionic recommendations. The emphasis within the current quantity is put on ion-solvent results, considering the fact that a couple of very good texts conceal the extra normal points of electrolyte strategies, in keeping with the classical theories of Debye, Huckel, On sager, and Fuoss. it's fascinating to take a position as to while a concept turns into "classical." might be this happens whilst it has turn into renowned, good loved, and lots more and plenty tailored. The above-mentioned theories of ionic equilibria and delivery definitely satisfy those standards. There comes a time while the refinements and differences can now not be regarding actual importance and will now not conceal the truth that convinced primary assumptions made within the improvement of the speculation are untenable, specifically within the gentle of data received from the applying of refined molecular and thermodynamic techniques.

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It will be noted that in these two examples, which are chosen from the literature, the ionic radii are approximated differently. In fact, the choice of the ri* turns out to be a major problem in applications of this model. Perhaps this is inevitable; real ions are not hard spheres, so there is bound to be some uncertainty as to which value for the hard-sphere radius best represents a given ion in a given situation. 4. From the study of Figs. 6 and 7 it may be concluded that Born's model is good enough to represent the major part of the hydration free energy and its variation with ionic charge and size.

5. 7, to compare a theory of ionic solvation with experiment does not require data for single-ion properties. Rather, it is the other way around: If one has a theory, by comparing theory and ex- 1bermodymunics of Ionic Hydration 2S periment, the "best" single-ion results can be deduced from the data, in the framework of the theory. This has led to much theoretical work with the objective of deducing single-ion thermodynamic coefficients from data as a first step in the molecular interpretation of the data.

However, in comparison of his models with hydration entropies and volumes for larger ions, Glueckauf finds discrepancies which point to the need for a more "chemical" interpretation of the interaction of ions with the neighboring water molecules. Perhaps this is sufficient justification to omit further mention of many studies of models centered on the locally varying dielectric constant, beginning with that of Webb(824) and represented very recently by Laidler and Muirhead-Gould, (483) but it may also be noted that all these studies of electrostrictive effects on ionic solution properties have been recently reviewed by Conway.

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