Thermodynamics of Aqueous Lithium Nitrate Solutions at 298.15 to 398.15 K and 0.1 to 60 MPa

Abstract

The activity and osmotic coefficients of electrolyte solutions are relatively scarce under super-ambient conditions. This study computes the activity and osmotic coefficients of aqueous lithium nitrate solutions to a molality of 7 mol·kg⁻¹, within the pressure range 0.1 to 60 MPa, and temperature range 298.15 K to 398.15 K. In particular, the pressure dependences of the activity and osmotic coefficients have been estimated with the equations derived by Rogers and Pitzer (J Phys Chem Ref Data 11:15–81, 1982) on the basis of the Pitzer ion-interaction approach using the literature apparent molar volume data. These pressure effects in conjunction with the low-pressure activity and osmotic coefficient data on aqueous lithium nitrate solutions provide estimates of the values of these coefficients under high pressures. Effects of temperature, pressure, and molality on the activity and osmotic coefficients have been discussed.