Pressure effect on conductance of aqueous solutions of potassium halides

Abstract

The conductances of the aqueous solutions of potassium halides have heed measured at 15～40℃ up to 1500kg/cm^2. The limiting molar conductivities, Λ°(KX) were determined by the extrapolation to zero concentration in the Kohlrausch plots. There is good agreement between the present data of Λ°(KX) and those calculated with the empirical equations in pressure by Gancy and Brummer. The limiting molar conductivities of the ions, K^+, Cl^-, Br^- and I^- were calculated with the transport numbers of K^+ ion, respectively. The variations of the conductivity ratio λ_p°/λ_1° of each ion with pressure were characteristic and may be ascribed to the various effects induced by the ion, pressure and temperature on the three dimensional order of water. On the contrary to the received view, judging from these results, Cl^- and Br^- ions would apparently behave like the structure maker, as F^- ion, and K^+ and I^- ions the structure breaker at atmospheric pressure.