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A Potentiometric Study of the Association of Copper(II) and Sulfate Ions in Aqueous Solution at 25 °C

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Abstract

A study of the association between copper(II) and sulfate ions in aqueous solution has been made using copper ion-selective electrode potentiometry at constant ionic strengths (I) of 0.05, 0.1, 0.25, 0.5, 1.0, 3.0 and 5.0 mol·L−1 in NaClO4 media at 25 °C. Only one complex was detected, corresponding to the equilibrium: \( {\text{Cu}}^{ 2+ } ({\text{aq}}) + {\text{SO}}_{4}^{2 - } ({\text{aq}}) \rightleftarrows {\text{CuSO}}_{4}^{0} ({\text{aq}}). \) No higher order complexes were detected even at sulfate/copper(II) concentration ratios of up to 1,000. The present potentiometric values of log10 K 1(I) are shown to be consistently higher than those obtained by UV–Vis spectrophotometry because of the failure of the latter technique to detect all of the solvent-separated ion pairs present. Extrapolation of log10 K 1(I) to infinite dilution using an extended Guggenheim equation yielded a standard state value of log10 \( K_{1} \{ {\text{CuSO}}_{4}^{0} ({\text{aq}})\} = 2.32 \pm 0.09 \), which is in excellent agreement with a recent IUPAC-recommended value.

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Acknowledgments

The authors thank Andreas Nazet, University of Regensburg, Germany, for graphics assistance.

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  1. Chemistry Department, Murdoch University, Murdoch, WA, 6150, Australia

    Chandrika Akilan, Peter M. May & Glenn Hefter

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  1. Chandrika Akilan
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  2. Peter M. May
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  3. Glenn Hefter
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Correspondence to Glenn Hefter.

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Akilan, C., May, P.M. & Hefter, G. A Potentiometric Study of the Association of Copper(II) and Sulfate Ions in Aqueous Solution at 25 °C. J Solution Chem 43, 885–892 (2014). https://doi.org/10.1007/s10953-014-0170-7

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  • DOI: https://doi.org/10.1007/s10953-014-0170-7

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