Correspondence of Change of Structure of Water with the Change of Apparent Volumes of Ions in Solution

Authors

G. W. Stewart, State University of IowaFollow
James A. Jacobs, State University of IowaFollow

Document Type

Research

Abstract

Careful measurements were made of the diffraction curves of dilute aqueous solutions of LiCl, NaCl, KCl, NH₄Cl, MgCl₂, Co (C₂H₃O₂) CoCl₂, KClO₃, and AICl₃. In view of the inadequacy of the free ion theory to explain the nature of the change of apparent volume of ions in solutions, any evidence of any kind of correlation with that change is important. The x-ray diffraction of water was used to determine the magnitude of the alteration of water structure by the presence of ions. It is found that when the change of apparent molal ionic volume with concentration is more rapid, the alteration in the water structure is greater. The correlation is strong enough to make quite certain that the change of water structure is an important factor in the apparent volume change of the ions. With KClO₃ the apparent molal volume of the ions decreases with concentration, which is in the opposite sense. If the water structure is important, as claimed, then this structure must decrease in density with concentration of the ions. The x-ray diffraction of KClO₃ indicates that the alteration in water structure is certainly very different than in the cases of the other ions, and to this extent is confirmatory.

Publication Date

1938

Journal Title

Proceedings of the Iowa Academy of Science

Volume

45

Issue

1

First Page

187

Last Page

187

Copyright

©1938 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Recommended Citation

Stewart, G. W. and Jacobs, James A. (1938) "Correspondence of Change of Structure of Water with the Change of Apparent Volumes of Ions in Solution," Proceedings of the Iowa Academy of Science, 45(1), 187-187.
Available at: https://scholarworks.uni.edu/pias/vol45/iss1/40