Application of the Bahe's pseudolattice-theory to water-1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF(4)) mixtures at 298.15K Part I. Autoprotolysis constants.

Talanta

Université Pierre et Marie Curie-PARIS6, CNRS-ENSCP, UMR7575, Energétique et Réactivité aux Interfaces, UPMC, case 39, 4 place Jussieu, 75252 Paris cedex 05, France.

Published: April 2007

The autoprotolysis constants (K(s)) of water - 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF(4)) mixtures were determined at 298K over the composition range of 0 to 77.43vol.% bmimBF(4) using potentiometric method with a glass electrode. A slight increase in the autoprotolysis constant was observed when the salt was added to the water. The value of the ionic product of the medium then decreases as the bmimBF(4) content increases from about 20vol.%. The acid-base properties of these media were perfectly described by Bahe's approaches that were completed by Varela et al. concerning structured electrolyte solutions with large short-range interactions.

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http://dx.doi.org/10.1016/j.talanta.2006.10.008DOI Listing

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