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ERIC Number: EJ1050717
Record Type: Journal
Publication Date: 2015-Jan
Pages: 4
Abstractor: As Provided
Reference Count: 12
ISBN: N/A
ISSN: ISSN-0021-9584
Gravimetric Analysis of Bismuth in Bismuth Subsalicylate Tablets: A Versatile Quantitative Experiment for Undergraduate Laboratories
Davis, Eric; Cheung, Ken; Pauls, Steve; Dick, Jonathan; Roth, Elijah; Zalewski, Nicole; Veldhuizen, Christopher; Coeler, Joel
Journal of Chemical Education, v92 n1 p163-166 Jan 2015
In this laboratory experiment, lower- and upper-division students dissolved bismuth subsalicylate tablets in acid and precipitated the resultant Bi[superscript 3+] in solution with sodium phosphate for a gravimetric determination of bismuth subsalicylate in the tablets. With a labeled concentration of 262 mg/tablet, the combined data from three different courses (general chemistry I and II and quantitative analysis) determined an average tablet concentration of 272.0 mg/tablet, with a standard deviation of ±48.46 mg. When analyzed by upper-division students, an average of 268.8 mg/tablet with a standard deviation of 16.02 mg was obtained, which confirmed the labeled concentration. In addition, students were given an opportunity to react the remaining solution with aluminum to reduce the ionic bismuth and produce a solid metal product, which reinforced the concepts of precipitation, stoichiometry, and reduction-oxidation in a single laboratory experiment.
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A