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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > July  >
In the Laboratory
Alka-Seltzer Fizzing—Determination of Percent by Mass of NaHCO3 in Alka-Seltzer Tablets. An Undergraduate General Chemistry Experiment
Yueh-Huey Chen
Department of Nature Science Education, National Hualien Teacher College, Hualien 970, Taiwan, ROC

Jing-Fun Yaung
Department of Food Engineering, National Kaohsiung University of Applied Sciences at Kinmen, Taiwan, ROC

Cover
July 2002
Vol. 79 No. 7
p. 848
Abstract
In this article, we present a general chemistry stoichiometry experiment using materials involved in everyday life. Students practiced the concepts they had learned in the process of solving a problem. From this activity, they learned that a chemical reaction occurs when an Alka-Seltzer tablet is dropped into water. They observed the weight loss resulting from the generation of the gas product (CO2) in the reaction. According to the mole–mass relationship of the reaction, the amount of reactant being consumed was calculated from the measured weight loss. Students also practiced plotting experimental data through the use of a graphing program. The interpretation of the graph helped them comprehend the role a limiting reactant plays in the stoichiometry of a chemical reaction.
Supplement
Student laboratory handouts and notes for instructors are available.
*  Contents JCE2002p0848W.doc (Microsoft Word)
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*  Citation
 Chen, Yueh-Huey; Yaung, Jing-Fun. J. Chem. Educ. 2002 79 848.
*  Keywords
 Acid-Base Chemistry; General Chemistry; Quantitative Analysis; Stoichiometry; Laboratory Instruction
*  History
 Created:
Last Updated:		 June 17, 2002
March 16, 2005
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