Thermodynamic properties of aqueous (NH4)2SO4 to high supersaturation as a function of temperature

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)1079-1090
Journal / PublicationJournal of Chemical and Engineering Data
Volume40
Issue number5
Publication statusPublished - 1995
Externally publishedYes

Abstract

Equilibrium water vapor pressures over supersaturated aqueous ammonium sulfate have been determined from 278.15 to 313.15 K using an electrodynamic balance. Partial molar enthalpies of water (L1, to ∼25 mol kg-1) and partial molar heat capacities (J1, to ∼8 mol kg-1) have been calculated from the measurements, together with enthalpies of solution, heat capacities, and boiling point elevations. The results have been used to parameterize a mole-fraction-based activity coefficient model. Equilibrium constants for the reaction (NH4)2SO4(cr) ⇄ 2NH4 + (aq) + SO4 2- (aq) have been evaluated from 373.15 K to the eutectic point (5.00 mol kg-1, 254.21 K). The model satisfactorily represents water vapor pressures and saturation with respect to solid phases ice and ammonium sulfate from 253 to >373.15 K and up to 8-10 mol kg-1, and water vapor pressures from 278.15 to 313.15 K and up to ∼25 mol kg-1. © 1995 American Chemical Society.

Citation Format(s)

Thermodynamic properties of aqueous (NH4)2SO4 to high supersaturation as a function of temperature. / Clegg, Simon L.; Ho, Sau Sau; Chan, Chak K.; Brimblecombe, Peter.

In: Journal of Chemical and Engineering Data, Vol. 40, No. 5, 1995, p. 1079-1090.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review