Apparent and partial molal volumes in mixed salt solutions. I. The ternary systems LiCl–LiNO3–H2O, NaCl–NaNO3–H2O and KCl–KNO3–H2O

The densities of aqueous mixtures of LiCl–LiNO3, NaCl–NaNO3, and KCl–KNO3 were determined at 25 °C at constant chloride-nitrate molality ratios. The mean apparent molal volumes were calculated and found to obey the limiting law modified by additional terms in ionic strength. The partial molal volumes for the electrolytes in each mixture were calculated and the conditions under which Young and Smith’s mixtures rule held were examined. The results obtained are discussed and interpreted in terms of ion–ion interactions and v0 (Friedman’s parameter).