Changes of heat content of aqueous solutions of Na2SO4 and of NaCl-Na2SO4 mixtures have been measured between 60 and 220°C by means of a drop calorimeter Standard procedure yielded the corresponding heat capacity data. These data were analyzed in terms of Pitzer's theory which enables the calculation of the parameters β0, β1 and Cφ for Na2SO4(aq), which are valid up to 3 mol kg-1, and the binary mixed interaction term XXXCISO4. These new data were utilized, in the framework of the ion interaction model, to reproduce experimental values of the heat capacity data of the quaternary system Na+/K+/Cl-/SO4 2-/ H2O. The critical points of this description are discussed.
Mixed interaction terms in the use of Pitzer equations: Application to the heat capacities of the reciprocal system sodium(1+)/potassium(1+)/chloride/sulfate/water at high temperatures
CONTI, GIOVANNI;GIANNI, PAOLO ANGELO;TINE', MARIA ROSARIA
1989-01-01
Abstract
Changes of heat content of aqueous solutions of Na2SO4 and of NaCl-Na2SO4 mixtures have been measured between 60 and 220°C by means of a drop calorimeter Standard procedure yielded the corresponding heat capacity data. These data were analyzed in terms of Pitzer's theory which enables the calculation of the parameters β0, β1 and Cφ for Na2SO4(aq), which are valid up to 3 mol kg-1, and the binary mixed interaction term XXXCISO4. These new data were utilized, in the framework of the ion interaction model, to reproduce experimental values of the heat capacity data of the quaternary system Na+/K+/Cl-/SO4 2-/ H2O. The critical points of this description are discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
