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  Home > JCE Print > Journal of Chemical Education > Issues > 1998  > March  >
In the Laboratory
Fractional Factorial Experimental Design as a Teaching Tool for Quantitative Analysis
Philip J. Oles
Lebanon Valley College, Department of Chemistry, 101 N. College Ave., Annveille, PA 17003-0501
Cover
March 1998
Vol. 75 No. 3
p. 357
Abstract
Fractional factorial experimental design is introduced as a group laboratory exercise in quantitative analysis. The classical gravimetric determination of chloride by precipitation with silver ion serves as the basis for this work. Using the designs of Genichi Taguchi, five experimental factors are studied in a two level, eight trial matrix. Students are assigned individual experiments called cells with assigned levels for the factors. Determinations of chloride in certified samples with varying levels of chloride (48% - 60%) are performed in triplicate by the students. The data is analyzed by calculating the level averages for each factor at each of their levels. Since many students run the experiments under less than optimum conditions, the connection between less than ideal precipitate characteristics and systematic error are emphasized.
More Information
*  Citation
 Oles, Philip J. J. Chem. Educ. 1998 75 357.
*  Keywords
 Laboratory Instruction, Gravimetry, Quantitative Analysis, Teaching/Learning Aids, Statistical Mechanics, Analytical Chemistry
*  History
 Created:
Last Updated:		 June 28, 1999
June 24, 2005
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