Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/103028
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Type: Journal article
Title: Effect of solvent activity on solute association: the formation of aqueous nickel(II) chloride complexes studied by UV-Vis and EXAFS spectroscopy
Author: Zhang, N.
Zeng, D.
Brugger, J.
Zhou, Q.
Ngothai, Y.
Citation: Journal of Solution Chemistry, 2015; 44(6):1320-1338
Publisher: Springer
Issue Date: 2015
ISSN: 0095-9782
1572-8927
Statement of
Responsibility: 
Ning Zhang, Dewen Zeng, Joël Brugger, Quanbao Zhou, Yung Ngothai
Abstract: Water activity is generally considered to affect ionic association in aqueous electrolyte solutions; however, it is usually ignored when the association reactions or constants are discussed. In this work, the effect of water activity on the association reaction Ni2+(aq)+nCl−(aq)⇌NiCl2−nn (aq) was investigated by EXAFS and UV–Vis spectroscopy measurements on NiCl2 aqueous solutions at room temperature with constant Cl−/Ni2+ ratio (~66) and various water activities; the latter were adjusted by adding MgCl2 and Mg(ClO4)2. Both the EXAFS and the UV–Vis spectra measurements indicated that the extent of Ni–Cl association increases in decreasing water activity environments, independent on the Cl−/Ni2+ ratio. Thus, the effect of water activity on the ionic association should not be ignored and more emphasis should be paid on it, especially, when the water activity is very low.
Keywords: EXAFS; UV–Vis spectroscopy; water activity; speciation; NiCl₂
Rights: © Springer Science+Business Media New York 2015
DOI: 10.1007/s10953-015-0334-0
Appears in Collections:Aurora harvest 3
Chemical Engineering publications

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