Critical evaluation of CuSO4-H2O system up to solubility limit, from eutectic point to 373.15 K

David Sibarani, Hannu Sippola*, Pekka Taskinen, Daniel Lindberg

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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The solubility of copper(II) sulfate in water as a function of temperature and ionic strength is successfully modelled using Pitzer formalism. Four types of experimental data from the literature were implemented for the assessment, namely activity and osmotic coefficients, freezing point depression and solubility of CuSO4 in water. This work proved that four Pitzer parameters with eight terms are sufficient to create a consistent thermodynamic model of the CuSO4-H2O system up to 5 mol/kg-H2O of CuSO4, from the eutectic point to 373.15 K. The whole optimization study included a critical deviation analysis to sort out less reliable experimental data. To verify the results of this work, comparisons were carried out with experimental data which were not included in the assessment, i.e. the vapour pressure of the saturated solution, thermodynamic values of the cell reaction as well as electrochemical cell potential (EMF).

Original languageEnglish
Article number117689
Number of pages18
JournalChemical Engineering Science
Early online date27 May 2022
Publication statusPublished - 10 Aug 2022
MoE publication typeA1 Journal article-refereed


  • Activity coefficient
  • Pitzer model
  • Reaction
  • Solubility
  • Vapour pressure
  • Water activity


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