Correlation of osmotic coefficient data for ZnSO4(aq) at 25 degrees C by various thermodynamic models
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The available literature data on the osmotic coefficient of ZnSO4(aq) at 25degreesC in the molality range from 0.1 to 4.3 mol-kg(-1) and new experimental data from 1.2 to 2.9 mol-kg(-1), at the same temperature, are presented. Selected values of the osmotic coefficient from all the data are analyzed using the Clegg-Pitzer-Brimblecombe model, the extended Pitzer model, and a semiempirical equation comprising a power series in molality added to the Debye-Huckel limiting law. The extended Pitzer equation and the Clegg-Pitzer-Brimblecombe equations give the best results in fitting the osmotic coefficient data. All three models are used to calculate ZnSO4 activity coefficients at 25degreesC in dilute solutions (<0.1 mol-kg(-1)) for comparison with published values.
Keywords:Isopiestic measurements / Zinc sulfate / Osmotic coefficient / Activity coefficient / Extended Pitzer model / Clegg–Pitzer–Brimblecombe model / Semiemprical equation
Source:Journal of Solution Chemistry, 2003, 32, 4, 371-383
- This work was supported by the Ministry for Science, Technology and Development, of the Republic of Serbia under Project No. 1891.