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Journal of Solution Chemistry

, Volume 48, Issue 11–12, pp 1657–1670 | Cite as

Remarks on the Evaluation of Thermodynamic Data for Sulfate Ion Protonation

  • Glenn HefterEmail author
  • Cezary Gumiński
Article
  • 63 Downloads

Abstract

A thorough search of the scientific literature under the auspices of the IUPAC Sub-Committee on Solubility and Equilibrium Data (SSED) has identified and compiled quantitative thermodynamic data for the first sulfate protonation step from about 270 papers, reports, books and electronic databases. A critical evaluation of these sources using well-defined criteria has rejected about half of them. The remaining (‘accepted’) data reveal that the standard state values of the first protonation constant of the sulfate ion, \(K_{1}^{\text{o}}\), corresponding to the equilibrium: \({\text{SO}_{4}^{2 - }} ({\text{aq}}) + {\text{ H}}^{ + } \left( {\text{aq}} \right) \rightleftharpoons {{\text{HSO}}_{4}^{ - }}({\text{aq}})\) at infinite dilution, are known to good levels of accuracy up to ~ 250 °C. However, at higher temperatures, and at all temperatures in the presence of added electrolytes, the equilibrium constant values are much less certain. The corresponding values for the enthalpy (\(\Delta_{\text{r}} H_{1}^{\text{o}}\)), entropy (\(\Delta_{\text{r}} S_{1}^{\text{o}}\)) and isobaric heat capacity (\(\Delta_{\text{r}} C_{p,1}^{\text{o}}\)) changes are also moderately well determined at near-ambient temperatures but are much more poorly defined both at higher temperatures and in the presence of even modest concentrations of added electrolytes. Comments on a number of aspects of the data and their evaluation are provided.

Keywords

Sulfate Bisulfate Sulfuric acid Protonation Dissociation Stability constant Enthalpy Entropy Heat capacity 

Notes

Acknowledgements

This work was funded by the Analytical Division of the International Union of Pure & Applied Chemistry (IUPAC) via the project Stability Constants and Related Thermodynamic Data of Metal-Ion/Sulfate Complexes in Aqueous Solution, and (in part) by Rio Tinto Innovation (Melbourne) and the Australian Government via the Australian Research Council Linkage Grant LP130100991.

Supplementary material

10953_2019_907_MOESM1_ESM.doc (66 kb)
Supplementary material 1 (DOC 66 kb)

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Authors and Affiliations

  1. 1.Chemistry DepartmentMurdoch UniversityMurdochAustralia
  2. 2.Chemistry DepartmentUniversity of WarsawWarsawPoland

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