Document Type
Article
Publication Date
1-1-2011
Publication Title
The Jounal of Physical Chemistry
Volume
115
Issue Number
49
First Page
14784
Last Page
14788
DOI
10.1021/jp206486z
Disciplines
Biochemistry | Other Chemistry
Abstract
This study examines the properties of a 4 × 2 matrix of aqueous cations and anions at concentrations up to 8.0 M. The apparent molar water volume, as calculated by subtracting the mass and volume of the ions from the corresponding solution density, was found to exceed the molar volume of ice in many concentrated electrolyte solutions, underscoring the nonideal behavior of these systems. The solvent properties of water were also analyzed by measuring the solubility of diketopiperazine (DKP) in 2.000 M salt solutions prepared from the same ion combinations. Solution rankings for DKP solubility were found to parallel the Hofmeister series for both cations and anions, whereas molar water volume concurred with the cation series only. The results are discussed within the framework of a desolvation energy model that attributes solute-specific changes in equilibria to solute-dependent changes in the free energy of bulk water.
Recommended Citation
Daryl K. Eggers, A. Y. Payumo, R. M. Huijon, D. D. Mansfield, L. M. Belk, A. K. Bui, and A. E. Knight. "Changes In Apparent Molar Water Volume and DKP Solubility Yield Insights on the Hofmeister Effect" The Jounal of Physical Chemistry (2011): 14784-14788. https://doi.org/10.1021/jp206486z
Comments
Copyright © 2011 American Chemical Society. The definitive version is available online at http://dx.doi.org/10.1021/jp206486z.