DENSITY AND DIELECTRIC PERMEABILITY OF AQUEOUS SOLUTIONS OF REE CHLORIDES OF MEDIUM-HEAVY GROUP IN PRESENCE OF SODIUM CHLORIDE

Abstract

The densities of mixed solutions of rare-earth elements of the medium-heavy group with NaCl were determined by the pycnometric method. Aqueous solutions of NaCl with concentrations of 10,50,100,150,200, 220 g/dm3 containing lanthanide chlorides of the medium-heavy group with a concentration range from 0.05 mol/dm3 to 1.73 mol/dm3 at pH = 1.5 were studied. Dielectric permittivity of solutions with the concentration of the aggregate REE in the aqueous phase from 0.05 mol/dm3 to 0.75 mol/dm3 and NaCl concentration equal to 150 g/dm3 was measured in the frequency range from 0.5 to 110 MHz. Empirical equations were constructed that relate the density of the solution to the concentration of NaCl, to the concentration of the sum of rare-earth elements, and to the dielectric permittivity. These equations make it possible to calculate the concentration of sodium chloride from the density of solution and from the aggregate REE concentration. The empirical formula makes it possible to calculate the concentration of the sum of REE chlorides of the medium-heavy group at a known concentration of sodium chloride from the dielectric permittivity of the aqueous solution