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  Home > JCE Print > Journal of Chemical Education > Issues > 2009  > July  >
In the Laboratory
Wash Bottle Laboratory Exercises: Mass of NaHCO3 in an Alka-Seltzer Tablet, Molar Mass of CO2, and the Ideal Gas Law Constant
Frazier Nyasulu, Shadrick Paris, and Rebecca Barlag
Department of Chemistry and Biochemistry, Ohio University, Athens, OH 45701
Cover
July 2009
Vol. 86 No. 7
p. 842

Abstract
We describe a wash bottle water displacement setup used to determine the mass of NaHCO3 in an Alka-Seltzer tablet, the molar mass of CO2, and the ideal gas law constant, all these being determined from a single experimental trial. Since a typical trial takes 10–15 minutes, multiple trials are performed (N = 5) and the 95% confidence intervals of the mean are calculated. Students' results are precise and accurate.
Supplement
Instructions for the students including pre- and inlaboratory questions; Notes for the instructor
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Contents
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Citation
Nyasulu, Frazier; Paris, Shadrick; Barlag, Rebecca. J. Chem. Educ. 2009, 86, 842.
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Keywords
Acids / Bases; Consumer Chemistry; Drugs / Pharmaceuticals; First-Year Undergraduate / General; Gases; Hands-On Learning / Manipulatives; High School / Introductory Chemistry; Laboratory Instruction; Physical Chemistry; Quantitative Analysis; Stoichiometry
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History
Created:
Last Updated:
6/1/2009
6/9/2009
 Caution! 
Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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