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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > July  >
In the Classroom
Sulfuric Acid and Water: Paradoxes of Dilution
I. A. Leenson
Department of Chemistry, Moscow State University, Moscow 119899, Russia
Cover
July 2004
Vol. 81 No. 7
p. 991
Abstract
The principal goal of this article is to elucidate some uncommon phenomena that can be observed in the process of diluting sulfuric acid with water. The thermochemistry and equilibrium properties of aqueous solutions of sulfuric acid are described. It is shown that even in very dilute solutions, dissociation of sulfuric acid proceeds completely only for the first equilibrium. The article contains interesting information about thermochemical measurements carried out in the 19th century and a discussion concerning the heats of hydratation. It also describes the possibility of obtaining unexpected results from the experimental data presented in the literature on the subject. Supplemental Material contains questions for students with answers and possible solutions. The questions and the discussions will be useful in general, inorganic, and physical chemistry courses.
Supplement
Problems and assignments for students, together with answers and possible solutions, are available.
*  Contents JCE2004p0991W.doc (Microsoft Word)
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*  Citation
 Leenson, I. A. J. Chem. Educ. 2004 81 991.
*  Keywords
 Acid–Base Chemistry; Aqueous Solution Chemistry; Calorimetry; General Chemistry; History / Philosophy; Physical Chemistry; Problem-Based Learning
*  History
 Created:
Last Updated:		 May 27, 2004
January 19, 2005
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