Molten salt mixtures. VIII. The refractive index of molten salt mixtures and their molar refractivities

Abstract

The refractive index of molten NaCl, KCl, CdCl₂, and PbCl₂ and of the molten systems NaCl + CdCl₂, NaCl + PbCl₂, KCl + CdCl₂, and KCl + PbCl₂ has been measured over a range of temperature. From these results and published density data, molar refractivities have been calculated. The deviation of molar refractivity from the values calculated on the basis of additivity gives further evidence for the formation of complex ions in the KCl + CdCl₂ and KCl + PbCl₂ systems. In the NaCl + CdCl₂ and NaCl + PbCl₂ systems there is simple mixing without interaction.