A potentiometric study of the association of copper(II) and sulfate ions in aqueous solution at 25 °C
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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: (Formula presented.) No higher order complexes were detected even at sulfate/copper(II) concentration ratios of up to 1,000. The present potentiometric values of log10K1(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 log10K1(I) to infinite dilution using an extended Guggenheim equation yielded a standard state value of log10(Formula presented.), which is in excellent agreement with a recent IUPAC-recommended value.
|Publication Type:||Journal Article|
|Murdoch Affiliation:||School of Engineering and Information Technology|
|Copyright:||© 2014 Springer Science+Business Media New York.|
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