Isopiestic Determination of the Osmotic and Activity Coefficients of K2SO4(aq) at the Temperatures 298.15 and 323.15 K, and Revision of the Thermodynamic Properties of the K2SO4 + H2O System

Published

December 1, 2002

Author(s)

D A. Palmer, Donald G. Archer, J A. Rard

Abstract

Isopiestic vapor-pressure measurements were made for K₂SO₄(aq) from 0.228 to 0.740 mol^.kg^-1 at 298.15 k and from 0.219 to 0.957 mol^.kg^-1 at 323.15 K, using NaCl(aq) as the isopiestic reference standard. These isopiestic measurements extend to saturation at 323.15 K and to slightly above saturation at 298.15 K. There are no previous isopiestic studies for K₂SO₄ (aq) at 323.15 K. Thermodynamic properties from the literature for the potassium sulfate + water system and the present measurements were used to generate equations that represented the thermodynamic properties of this system from the freezing point of the aqueous solution to 500 K. The measured values included in the fitted equations spanned the range of temperature of approximately 271 K to 530 K for K₂SO₄(aq).

Citation

Journal of Chemical and Engineering Data

Volume

47

Issue

No. 6

Pub Type

Journals

Keywords

Potassium sulfate, thermodynamic properties

Citation

Palmer, D. , Archer, D. and Rard, J. (2002), Isopiestic Determination of the Osmotic and Activity Coefficients of K₂SO₄(aq) at the Temperatures 298.15 and 323.15 K, and Revision of the Thermodynamic Properties of the K₂SO₄ + H₂O System, Journal of Chemical and Engineering Data (Accessed May 7, 2024)