Abstract
Conductance of univalent ions in DMSO (dimethyl sulfoxide), DMF (dimethylformamide) and PC (propylene carbonate) was determined by use of tetrabutylammonium-tetrabutylborate as standard electrolyte of equal cationic and anionic conductance. Empirical formulation of Stokes’ radius was attempted on the assumption of a structure-cavity affecting the ionic transport in a medium of aprotic and polar solvent as well as water. By application of classical fluid dynamics Stokes’ radius rs is given in terms of −(2⁄3)rc+(1⁄σs) (rc–ro)2, where rc is crystal ionic radius, ro and σs are parameters characteristic of the cavity and molecular sizes, respectively, with respect the solvent.
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