CONDUCTANCE OF SODIUM AND TETRAETHYLAMMONIUM IODIDES IN MIXTURES OF WATER WITH 1-PROPANOL AND WITH 2-PROPANOL

The conductivities of NaI and Et4NI in mixtures of water with 1-propan ol and 2-propanol at 25-degrees-C are reported. The conductivity data were analyzed via the Fuoss-Hsia equation to find both the equivalent conductance lambda0 as well as the association constant K(A), simultan eously/Basing on variations of the Walden products the effect of the s olvent composition on the ionic solvation has been discussed. In alcoh ol deficit mixtures, wherein hydrophobic interactions play an importan t role, the dehydration of Na+ and of Et4N+ ions has been found. For t he same compositions the distances between ions forming the ionic pair s also diminish. Et4N+ and I-forming pairs shared one water molecule, whereas Na+ and I- are able to form even contact ionic pairs.