Maximum de conductivite des solutions aqueuses d'electrolytes

Abstract

The conductivities and specific masses of concentrated aqueous solutions of alkaline and alkaline-earth salts were measured at 93°C. The ratio of the number of moles of water to the number of moles of salt where the maximum conductivity occurs (R max) was determined for all the investigated systems. The R max values are primarily determined by the charge of the cation. In the case of singly charged cations R max yields a value of about 8 while this ratio reaches a mean value of 20 for electrolytes with divalent cations. These R max values are correlated to the primary hydration numbers of the ions of the electrolyte. For a given concentration, the conductivities and equivalent conductances of mixtures of water and electrolytes with divalent cation clearly depend on the nature of the anion.