Osmotic coefficients of aqueous rare-earth perchlorates and nitrates

Abstract

Osmotic coefficients of aqueous solutions of La(ClO4)3, Pr(ClO4)3, Nd(ClO4)3, Sm(ClO4)3, Gd(ClO4)3, Dy(ClO4)3, Ho(ClO4)3, Er(ClO4)3, Tm(ClO4)3, Yb(ClO4)3, Lu(ClO4)3, Nd(NO3)3, Sm(NO3)3, and Gd(NO3)3 in the molality range from 0.1 mol kg-1 nearly to saturation at 298.15 K have been determined by the isopiestic method. The results obtained agree very well with those of Rard et al. published recently. A distinct two-series effect has been observed for the constant-molality values of rare-earth perchlorates. The results are discussed in terms of hydration of the cations and ionic association. © 1979.