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The Chemical Educator
ISSN: 1430-4171 (electronic version)
Abstract Volume 12
Issue 3 (2007) pp 177-178
Development of Binary Liquid–Vapor Phase Diagram Laboratory Procedures to Replace the Traditional Tetrachloroethylene/Cyclohexanone System
Kelly J. Gordon, Laura Kenkel, Stephanie Prescia and Marcy Towns*
Department of Chemistry, Ball State University, Muncie,
IN 47306;*Department of Chemistry, Purdue University, West Lafayette,
IN 47907,
mtowns@purdue.edu
Received September 22, 2006. Accepted December 15,
2006.
Published online: 4 June 2007
Abstract. This paper describes a straightforward experiment using the guided-inquiry approach for the extraction technique that is widely used in organic chemistry for purifying reaction products or to isolate natural products. This experiment extends the students' understanding of the acid–base reactions of organic molecules and the relationship of these reactions to chemical structure. It also promotes understanding of extraction separation techniques for organic compounds. The objective of this experiment is to allow the students to conduct an experimental procedure applying an acid–base reaction to the separation of two compounds by extraction techniques. Also, the students will be familiarized with the ferric chloride qualitative analysis test and with different types of filtration. This approach allows students to integrate different concepts learned throughout the general chemistry course in the context of organic chemistry. These concepts include pH, pKa, density, and solubility.
Key Words: Laboratories and Demonstrations; physical chemistry; Rauolt’s law; phases/phase transitions/diagrams; binary liquid–vapor phase diagram
(*) Corresponding author. (E-mail: mtowns@purdue.edu)
Article in PDF format (59 KB) HTML format
Supporting Materials:
Student handouts and information for instructors are available (132 KB).
Issue date: June
1, 2007
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