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The osmotic pressure of the ions and of the undissociated molecules of salts in aqueous solution

Bates, Stuart J. (1915) The osmotic pressure of the ions and of the undissociated molecules of salts in aqueous solution. Proceedings of the National Academy of Sciences of the United States of America, 1 (6). pp. 363-368. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:BATpnas15

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Abstract

The concentration of the ions (Ci) and that of the undissociated molecules (CU) are involved in the equation, Ci^2 / Cu = K, expressing the application of the law of mass-action to solutions of electrolytes. Hence the large divergence from this law which strong electrolytes exhibit may be due to the behavior of the ions, to that of the undissociated molecules, or to that of both. This so called anomalous behavior may be simply expressed by saying that for one or for both of these molecular species van't Hoff's law, II = CRT, where II is the osmotic pressure, C is the concentration in mols per unit-volume, R is the gas-constant, and T is the absolute temperature, does not hold; for, if all of the molecular species entering into an equilibrium obey this law, the law of mass-action is a thermodynamic necessity. [1] In this paper is outlined and applied a method for determining the extent to which the ions and the undissociated molecules deviate from van't Hoff's law, that is, for determining the relation between the osmotic pressure of the ions or of the undissociated molecules and their concentration. The significance of the results, particularly as applied to the calculation of the degree of ionization and to the validity of the law of mass-action, is discussed.


Item Type:Article
Additional Information:Copyright © 2005 by the National Academy of Sciences Presented to the Academy, April 27, 1915
Record Number:CaltechAUTHORS:BATpnas15
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BATpnas15
Alternative URL:http://www.pnas.org/content/vol1/issue6/
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3382
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:03 Jun 2006
Last Modified:14 Nov 2014 19:19

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