Isotope Effects on Apparent and Partial Molar Volumes of HCl, LiCl, and NaCl Measured in H2O and D2O from 250 C to 350 C and 14 MPa to 19 Mpa

Abstract

Apparent molar volumes have been measured for solutions of HCl (DCl), LiCl, and NaCl in H2O and D2O over the temperature range T = 250 oC to T = 350 oC and p = 14 MPa to p = 19 MPa using a high-temperature, high-pressure vibrating tube densimeter in the molality range 0.05 < m < 3.50 mol.kg-1. The experimental results have been represented using an extended Debye-Huckel equation to describe the molality dependence of the apparent molar volumes. The Born model and Krichevskii model have been used to describe solvent isotope effects. The results will contribute to developing models for predicting pD under CANDU reactor primary coolant conditions.