期刊
JOURNAL OF CHEMICAL THERMODYNAMICS
卷 34, 期 8, 页码 1329-1339出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1006/jcht.2002.0984
关键词
hygrometer; ammonium; lithium and sodium sulphate; aqueous solutions; relative humidity; water activity; osmotic coefficient; activity coefficient; excess Gibbs energy; Pitzer's model; extended compared activity
The water activities and osmotic coefficients of aqueous solutions of {(NH4)(2)SO4 + Li2SO4} and {(NH4)(2)SO4 + Na2SO4} have been determined at a temperature of 298.15 K with a hygrometric method, at molalities in the region 0.2 mol . kg(-1) to saturation of the solutes for different fractional ionic-strengths y = 0.2, 0.5, and 0.8 of (NH4)(2)SO4. The experimental results are compared with the predictions obtained from our extended compared additivity model, as well as the models reported by Zdanovskii, Stokes and Robinson, Pitzer. and Lietzke-Stoughton. Front these measurements, parameters of Pitzers model have been determined, These were used to predict solute activity coefficients in the mixture and calculate the excess Gibbs function at total molalities for different y for these systems. (C) 2002 Elsevier Science Ltd. All rights reserved.
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