Catalog Home Page

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.

Publication 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