Journal of Solution Chemistry

, Volume 6, Issue 9, pp 609–624 | Cite as

Ionic association in aqueous solutions of strong electrolytes

  • P. C. Carman
Article
Received:

Abstract

A more accurate calculation of relaxation effects obtained with the standard Debye-Hückel-Onsager model has been presented recently and is here applied to several aqueous 1:1 electrolytes. The variation of the standard deviation between calculated and observed equivalent conductivities withK A leads to an ill-defined minimum; but, where data over a wide concentration range are available, the minimum corresponds to values of the contact distancea which approximate to estimates from ionic dimensions. It is therefore proposed that, although preciseK A values from conductance cannot be determined, the most probable values are those associated with realistic estimates ofa. When data cover a limited concentration range, minimum standard deviations are often indeterminate or vary greatly for duplicate runs. It is shown that reasonable values ofK A can be obtained from such data if comparison is made at estimated values ofa.

Key Words

Electrolyte conductance ionic association relaxation effects Debye-Hückel theory 

Notation The symbols not defined in the text are the following

b

e2/εkTa for 1:1 electrolytes

e

electronic charge

k

Boltzmann gas constant

T

absolute temperature

ε

dielectric constant of solvent

δ

−(3/2y)(Λe0/Λ0)

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Copyright information

© Plenum Publishing Corporation 1977

Authors and Affiliations

  • P. C. Carman
    • 1
  1. 1.National Chemical Research LaboratoryCouncil for Scientific and Industrial ResearchPretoriaRepublic of South Africa

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