Abstract
The conductance of potassium nitrate and sodium bromide in mixtures of water and sulpholane covering the dielectric constant range 80 ≥ D ≥ 60 has been measured. These data and other previous data on potassium iodide in the same solvent mixtures were analyzed using the Fuoss 1980 equation in order to obtain the limiting molar conductances Λ O, the pairing distances R and the conductometric association constants K λ. The differences in the Gibbs energy Δ G per molecule between paired and unpaired ions were also calculated, setting Δ G = −kT ln( K λ / V M), where V M is the molar volume (in liters) of the solvent. The conventional association constant and the thermodynamic properties of the ion pairing are discussed with respect to the current information concerning the internal structure of the solvent mixtures and the specific properties of the ions.
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