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A Demonstration of Sample Segregation

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Mark D. Fritz

Department of Chemical Technology, University of Cincinnati, Cincinnati, OH 45206

Stephen B. Brumbach

Department of Chemistry, Western Wyoming Community College, Rock Springs, WY 82902-0428

JudithAnn R. Hartman

Department of Chemistry, United States Navel Academy, Annapolis, MD 21402-5026

J. Chem. Educ., 2005, 82 (2), p 255

DOI: 10.1021/ed082p255

Publication Date (Web): February 1, 2005

Section:

History, Education, and Documentation

Abstract

Handling a solid mixture can segregate its particles by size. A simple, visually-compelling demonstration shows students how stirring or pouring can segregate a mixture and create a nonuniform sample. The demonstration uses colored beads and other inexpensive, readily-available materials. The demonstration has proven useful for illustrating the importance of sample handling for students studying analytical chemistry and environmental chemistry.

Find this demonstration and others in the DigiDemos area of the JCE Digital Library.