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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > March  >
In the Laboratory
A Quantitative Examination of Multiple Methods for Standardizing a Dilute Hydrochloric Acid Solution in an Undergraduate Chemistry Laboratory
Nancy E. Meagher, Dana B. Bowens, and B. Shawn Clark
Department of Chemistry and Physics, Texas Woman's University, Denton, TX 76204
Cover
March 2005
Vol. 82 No. 3
p. 428
Abstract
The objective of the project was to compare the different published methods for standardizing dilute hydrochloric acid solutions. To date there are no known studies that have examined the possible methods of standardizing dilute HCl solutions for accuracy and precision when performed by undergraduate students. There are three different suitable bases available for the process and multiple indicator choices. This article attempts to identify the most accurate method(s) for use in the undergraduate laboratory. Students were given an "unknown" solution of dilute HCl and assigned to standardize it by eight methods (32 titrations), reporting both their experimental results and preference for the different indicator–base combinations. The results from a small sample of students indicate that there are some accuracy differences between possible methods.
Supplement
Instructions for the students and notes for the instructor are available.
*  Contents JCE2005p0428W.doc (Microsoft Word)
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JCE2005p0428W.pdf

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*  Citation
 Meagher, Nancy E.; Bowens, Dana B.; Clark, B. Shawn. J. Chem. Educ. 2005 82 428.
*  Keywords
 Acid–Base Chemistry; Analytical Chemistry; Laboratory Instruction; Quantitative Analysis
*  History
 Created:
Last Updated:		 February 2, 2005
February 18, 2005
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