ELECTRICAL CONDUCTANCES OF AQUEOUS SODIUM BROMIDE SOLUTIONS FROM 0 TO 800 DEGREES AND AT PRESSURES TO 4000 BARS

The electrical conductances of dilute (0.002-0.015 m) NaBr solutions were measured from O to 800° and to 4000 bars pressure. Isothermal limiting equivalent conductances were calculated from these measurements and were found to be linear functions of the solvent density. At temperatures of 400° and above, at constant solvent density, Λ0(NaBr) was independent of the temperature; moreover, the value of the limiting equivalent conductances extrapolated to zero solvent density (1880 cm2 ohm-1 equiv-1) was very close to those obtained previously for other 1:1 electrolytes, indicating that perhaps all 1:1 electrolytes may have nearly the same value of limiting equivalent conductance under these conditions. Equilibrium constants for the ionization of NaBr were calculated from the data at high temperatures where NaBr behaves as a weak electrolyte. By considering hydration to be an essential part of the dissociation process, isothermal equilibrium constants were obtained that were independent of solvent density.