Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

A potentiometric study of the association of copper(II) and sulfate ions in aqueous solution at 25 °C

Akilan, C., May, P.M. and Hefter, G. (2014) A potentiometric study of the association of copper(II) and sulfate ions in aqueous solution at 25 °C. Journal of Solution Chemistry, 43 (5). pp. 885-892.

Link to Published Version: http://dx.doi.org/10.1007/s10953-014-0170-7
*Subscription may be required

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: (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.

Item Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Springer Netherlands
Copyright: © 2014 Springer Science+Business Media New York.
URI: http://researchrepository.murdoch.edu.au/id/eprint/22662
Item Control Page Item Control Page