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A Greener Approach for Measuring Colligative Properties

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Sean M. McCarthy and Scott W. Gordon-Wylie

Department of Chemistry, University of Vermont, Cook Burlington, VT 05405

J. Chem. Educ., 2005, 82 (1), p 116

DOI: 10.1021/ed082p116

Publication Date (Web): January 1, 2005

Section:

History, Education, and Documentation

Abstract

As a first step towards the greening of instructional laboratories, we present a new greener version of a laboratory procedure designed to measure colligative properties. The greener procedure substitutes the nontoxic, noncarcinogenic compounds stearic, myristic, lauric, and palmitic acids for the less benign aromatic compounds p-dichlorobenzene, benzil, biphenyl, naphthalene, and nitrotoluene. Achieving educational goals without the concomitant generation of chlorinated and aromatic wastes is shown here to be both possible and practical. Furthermore, utilization of the benign fatty acid waste stream for other purposes, such as making soap, wax, or biodiesel, allows this laboratory to approach the zero waste benchmark.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Domain):

Physical Chemistry

Keywords (Feature):

Green Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Fatty Acids

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