Solubility Prediction of FeSO4 center dot 7H(2)O-ZnSO4 center dot xH(2)O-H2O (x=6, 7) System Using the Pitzer Ion-Interaction Model

The component solubilities of FeSO4 center dot 7H(2)O-ZnSO4 center dot xH(2)O-H2O (x = 6, 7) systems at 25 and 40 degrees C were calculated using Pitzer's ion-interaction model and its Harvie-Weare extension. The calculated results of FeSO4 center dot 7H(2)O-ZnSO4 center dot xH(2)O-H2O (x = 6, 7) systems are in good agreement with the experimental data both at 25 and 40 degrees C. The model can be extended to a wider range of temperatures for single- or multi-component systems using temperature-dependent binary parameters, providing an alternative approach for the prediction of electrolyte solubilities.