The Conductance of Sodium and Potassium Chlorides in 50-Mole Percent Methanol-Water Mixtures
- 1 April 1948
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 16 (4) , 336-339
- https://doi.org/10.1063/1.1746880
Abstract
The conductance of NaCl and KCl in 50‐mole percent methanol‐water mixtures has been measured at concentrations from 0.0005 to 0.01 N. The data can be represented within experimental error by the Onsager‐Shedlovsky equation, the limiting conductances being 66.62 and 75.10, respectively. The limiting conductances of chloride ion, obtained from these values, and the limiting transference numbers reported in the accompanying paper, satisfy the rule of independent ionic mobilities, but at finite concentrations the chloride ion conductance is less for the potassium salt than for the sodium. The decrease in limiting ion conductances as compared with those in water is greater than can be accounted for by viscosity alone. The results are also in disagreement with the Bjerrum theory of ion pair formation if the mean ionic diameter, determined thermodynamically, is significant in transport processes.Keywords
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