The conductance of tetrabutylammonium salts in water-sulfolane mixtures at 30°C

Conductance measurements are reported for Bu₄NCl, Bu₄NBr, Bu₄NI, and Bu₄NClO₄ at 30°C in water-sulfolane mixtures over the entire solvent composition range. Experimental data were analyzed by the 1965 Fuoss-Onsager-Skinner equation. The limiting equivalent conductances in water and in sulfolane were compared with literature values. The trends of the Walden products are discussed in terms of water structural changes caused by addition of sulfolane. As expected, on the basis of previous results reported in the literature, a significant amount of association was detected for Bu₄NI in water. Very small association constants were also found for Bu₄NI and Bu₄NClO₄ at 10 wt.% sulfolane.