Conductance of trimethylsulfonium halides (bromide and iodide) is measured at 25°C in methanol-water mixtures (44.94<D<73.92). The conductance parameters derived from the Fuoss-Onsager conductance theory indicate that the equivalent conductance at infinite dilution (Λo) and (a°) solvation for trimethylsulfonium halides decreases with the decrease of the dielectric constants until a certain minimum and then increases again. The plot of log KA versus 1/D is found to be linear indicating that the equation of association can be applied. The association constant is analyzed using the solvent separated –ion pair model.
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