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  Home > JCE Print > Journal of Chemical Education > Issues > 2003  > January  >
In the Laboratory
An Easy Determination of the Surface Chemical Properties of Simple and Natural Solids
Mélanie Davranche, Stella Lacour, François Bordas, and Jean-Claude Bollinger
Laboratoire des Sciences de l'Eau et de l'Environnement, Faculté des Sciences, Université de Limoges, 87060 Limoges, France
Cover
January 2003
Vol. 80 No. 1
p. 76
Abstract
Surface chemical properties of simple and natural solids are determined as a result of a rapid and straightforward methodology based on the surface-complexation model. Surface charges of the solid are determined by successive potentiometric titrations with an acid and a base. Solids are considered as amphoteric compounds and the functional surface groups are expressed by a generic binding site, ≡SOH. The intrinsic surface acidity constants, pKaS, and the pH of zero point charge, pHzpc, are calculated. From this tutorial, students gain experience in using both analytical techniques and geochemical modeling principle.
More Information
*  Citation
 Davranche, Mélanie; Lacour, Stella; Bordas, François; Bollinger, Jean-Claude. J. Chem. Educ. 2003 80 76.
*  Keywords
 Acid-Base Chemistry; Environmental Chemistry; Geochemistry; Solids; Laboratory Instruction; Titration / Titrimetry
*  History
 Created:
Last Updated:		 December 5, 2002
February 28, 2005
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