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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > January  >
In the Laboratory
A Didactic Experience of Statistical Analysis for the Determination of Glycine in a Nonaqueous Medium Using ANOVA and a Computer Program
M. J. Santos-Delgado and L. Larrea-Tarruella
Department of Analytical Chemistry, Complutense University, 28040 Madrid, Spain
Cover
January 2004
Vol. 81 No. 1
p. 97
Abstract
This article describes the statistical comparison of two back-titration methods for the determination of glycine in a glacial HAc medium. The titration is carried out using perchloric acid. The glycine quantities obtained were determined by several groups of students on the same day (three groups a day, on average; a total of 32 groups during the academic year) and were compared by two-way ANOVA with the Statgraphics Plus 3.0 computer program. The laboratory exercise discussed in this article is recommended for fourth-year undergraduates.
Supplement
Instructions for the students, notes for the instructor, theoretical background material, and gylcine results obtained for all 32 groups are available.
*  Contents Folder JCE2004p0097W containing sup.doc and Table 3.doc (Microsoft Word)
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More Information
*  Citation
 Santos-Delgado, M. J.; Larrea-Tarruella, L. J. Chem. Educ. 2004 81 97.
*  Keywords
 Analytical Chemistry; Computer-Based Learning; Laboratory Computing / Interfacing; Laboratory Instruction; Statistics / Data Analysis; Titration / Titrimetry
*  History
 Created:
Last Updated:		 December 8, 2003
February 18, 2005
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