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  Home > JCE Print > Journal of Chemical Education > Issues > 2003  > September  >
In the Laboratory
A Discovery Approach to Three Organic Laboratory Techniques: Extraction, Recrystallization, and Distillation
Gail Horowitz
Department of Chemistry, Yeshiva University, New York, NY 10033
Cover
September 2003
Vol. 80 No. 9
p. 1039
Abstract
This article describes three discovery-based experiments geared toward the beginning organic chemistry laboratory student. Each experiment focuses on one of the following purification techniques: extraction, recrystallization, or distillation. Unlike traditional purification-focused experiments whose goal is mastery of technique or optimization of results, the goal of these three experiments is students discovering for themselves the fundamental principles that underlie each technique. In each experiment, one or more parameters, such as solvent volume, time, or boiling point difference, is varied. Students compare the results of all variations and draw conclusions as to the underlying principles. The article concludes with an assessment of the effectiveness of these experiments.

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Instructions for the students, notes for the instructor, and a discussion of the sources of student error are available.
*  Contents JCE2003p1039W.doc (Microsoft Word)
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*  Citation
 Horowitz, Gail. J. Chem. Educ. 2003 80 1039.
*  Keywords
 Collaborative / Cooperative Learning; Inquiry-Based / Discovery Method; Laboratory Instruction; Organic Chemistry; Separation Science
*  History
 Created:
Last Updated:		 August 4, 2003
February 28, 2005
Link to Featured Molecules added (April 2004).
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