Isotope Effects on Standard and Partial Molar Volumes of NaCl, HCl and NaOH Measured in Light and Heavy Water at 250°C and 300°C

Abstract

Apparent molar volumes Vφ,2 were measured for aqueous solutions of NaCl, HCl (DCl), and NaOH (NaOD) in light and heavy water at 250 °C and 300 °C and p = 14 MPa using a vibrating platinum u-tube densitometer in the molality range from 0.25 < m < 2.5 mol kg-1. Standard partial molar volumes of NaCl, DCl and NaOD in heavy water were determined for the first time above 100 °C as part of an ongoing project in our lab to determine thermodynamic properties of electrolytes and non-electrolytes in heavy water under CANDU-PHW reactor primary coolant conditions.