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  Home > JCE Print > Journal of Chemical Education > Issues > 2007  > February  >
In the Laboratory
Thermochemical Analysis of Neutralization Reactions: An Introductory Discovery Experiment
Kenneth V. Mills and Louise W. Guilmette
Department of Chemistry, College of the Holy Cross, Worcester, MA 01610
Cover
February 2007
Vol. 84 No. 2
p. 326

Abstract
A guided-inquiry laboratory pedagogy called Discovery Chemistry, in which students discover chemical concepts in the lab and the instructor uses their pooled data to guide the lecture portion of the course, was developed by this chemistry department. A Discovery Chemistry experiment that reinforces the students' understanding of stoichiometry and allows them to discover neutralization reactions and thermochemistry is described. This experiment examines the neutralization of citric acid, lactic acid, and oxalic acid by sodium hydroxide. The comparison of the three acids facilitates the pooling of data and the ability to include testable hypotheses in pre- and post-laboratory discussions, key components of the Discovery process.
Supplement
Instructions for the students including a data sheet, notes for the instructor, teaching assistant guidelines, and a follow-up exercise are available.
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Citation
Mills, Kenneth V.; Guilmette, Louise W. J. Chem. Educ. 2007, 84, 326.
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Keywords
Acid–Base Chemistry; First-Year Undergraduate / General; Stoichiometry
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History
Created:
Last Updated:
1/9/2007
2/23/2007
 Caution! 
Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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