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A Concept-Based Environmental Project for the First-Year Laboratory: Remediation of Barium-Contaminated Soil by In Situ Immobilization

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Heather D. Harle , Phyllis A. Leber , Kenneth R. Hess and Claude H. Yoder

Department of Chemistry, Franklin and Marshall College, Lancaster, PA 17604-3003

J. Chem. Educ., 2003, 80 (5), p 561

DOI: 10.1021/ed080p561

Publication Date (Web): May 1, 2003

Abstract

This paper describes a laboratory project, designed for a first-year chemistry course, which uses environmental chemistry to teach concepts and techniques such as solubility determination, precipitation reactions, and the use of qualitative and quantitative analysis for product characterization. Students determine the relative insolubilites of a series of barium salts and uses a suction-extraction technique to quantitatively determine their solubilties. Students then learn about a very insoluble double salt of barium, prepares the double salt, and quantitatively determines its solubility and percent composition. The reagents used to prepare the double salt are used in situ to precipitate barium in a sample of barium-contamined soil. Finally, students determine the efficiency of the process by determining how much barium is retained in the soil after treatment. This laboratory experiment provides students with a firm basis in qualitative and quantitative analysis in the context of dealing with an environmental problem.

Keywords (Audience):

First-Year Undergraduate / General

Keywords (Domain):

Environmental Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Synthesis

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