Apparent molar heat capacity and relative enthalpy of aqueous sodium hydroxoaluminate between 323 and 523 K

Abstract

The apparent molar heat capacities, Cp,ϕ, of alkaline aqueous solutions of aluminum ion in excess NaOH have been measured at temperatures between 50 and 250°C in the overall molality range 0.3–1.7 mol-kg−1. Enthalpies of dilution, ΔLϕ, have also been determined at 99°C and apparent molar relative enthalpies, Lϕ, were calculated starting from 2.16 mol-kg−1 as the maximum concentration. Measurements of the above quantities have been performed by means of a differential flow calorimeter built in our laboratory and already described. The thermodynamic data obtained and the corresponding quantities for aqueous NaOH previously determined have been fitted to the equations of the Pitzer ionic interaction model to obtain parameters relative to aqueous NaAl(OH)4. These parameters permit the calculation of Cp,ϕ, and Lϕ for this species over the examined range of temperatures and concentrations.