Encyclopedia of Applied Electrochemistry

2014 Edition
| Editors: Gerhard Kreysa, Ken-ichiro Ota, Robert F. Savinell

Gas Solubility of Electrolytes

Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-6996-5_9

Introduction

It is well known that dissolved electrolytes influence the solubility of gases in aqueous solution. This is generally called the salting-out effect if the solubility of the gas is decreased relative to pure water as is most often the case.

Gas Solubility in Water

Gas solubility has been measured by a variety of means, for a wide variety of purposes. As a consequence of this, there exist at least ten expressions for the solubility of a gas in a liquid [5]. This is problematic as it is not always simple to convert between units. The units that are most relevant to expressing the influence of electrolytes on gas solubility are the Bunsen Coefficient (α), the mole fraction (X2), and the Henry’s law constant (KH,).

The Bunsen coefficient is unitless and is defined as the volume of pure gas (adjusted to 1 atm. and 273.15 K) V g, adsorbed by a unit volume of the pure solvent, V s, measured at a given temperature and a total pressure equivalent to the sum of the partial pressure of...
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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Applied MathematicsResearch School of Physical Sciences and Engineering, Australian National UniversityCanberraAustralia