Isopiestic Determination of the Osmotic Coefficients of Na2SO4(aq) at 25 and 50°C, and Representation with Ion-Interaction (Pitzer) and Mole Fraction Thermodynamic Models
作者： Joseph A. Rard , Simon L. Clegg , Donald A. Palmer
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摘要: Isopiestic vapor-pressure measurements were made for Na2SO4(aq) from 0.11 to3.74 mol-kg−1 at 25.00°C and 0.12 to 3.57 50.00°C, usingNaCl(aq) as the reference standard. Published isopiestic data, direct vaporpressures, emfs of reversible cells, freezing temperature depressions, boilingtemperature elevations, heat capacities, dilution enthalpies this system have beencritically assessed recalculated in a consistent manner. Parameters Pitzer'smodel mole fraction-based thermodynamic model evaluated. Themole is valid thefreezing temperatures solutions 150.5°C. Pitzer's represents theosmotic coefficients essentially experimental accuracy 25 and50°C provided that third virial coefficient was ionic-strength dependent.
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