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Wash Bottle Laboratory Exercises: Mass of NaHCO3 in an Alka-Seltzer Tablet, Molar Mass of CO2, and the Ideal Gas Law Constant

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Frazier Nyasulu , Shadrick Paris and Rebecca Barlag

Department of Chemistry and Biochemistry, Ohio University, Athens, OH 45701

J. Chem. Educ., 2009, 86 (7), p 842

DOI: 10.1021/ed086p842

Publication Date (Web): July 1, 2009

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.

Keywords (Audience):

First-Year Undergraduate / General

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Acids / Bases

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Oxalate Synthesis and Pyrolysis: A Colorful Introduction to Stoichiometry
Michael W. Vannatta and Michelle Richards-Babb, Robert J. Sweeney
Journal of Chemical Education2010 87 (11), 1225-1229
- Oxalate Synthesis and Pyrolysis: A Colorful Introduction to Stoichiometry
  Michael W. Vannatta and Michelle Richards-Babb, Robert J. Sweeney
  Journal of Chemical Education2010 87 (11), 1225-1229
  Metal oxalate synthesis and pyrolysis provides an opportunity for students to (i) learn stoichiometry, (ii) experience the consequences of proper stoichiometric calculations and experimental techniques, and (iii) be introduced to the relevance of ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Wash Bottle Laboratory Exercises: Iodide-Catalyzed H₂O₂ Decomposition Reaction Kinetics Using the Initial Rate Approach
Rebecca Barlag and Frazier Nyasulu
Journal of Chemical Education2010 87 (1), 78-80
- Wash Bottle Laboratory Exercises: Iodide-Catalyzed H₂O₂ Decomposition Reaction Kinetics Using the Initial Rate Approach
  Rebecca Barlag and Frazier Nyasulu
  Journal of Chemical Education2010 87 (1), 78-80
  A wash bottle water displacement scheme is used to determine the kinetics of the iodide-catalyzed H2O2 decomposition reaction. The reagents (total volume 5.00 mL) are added to a test tube that is placed in a wash bottle containing water. The mass of the ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links

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Received: August 03, 2009

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Wash Bottle Laboratory Exercises: Mass of NaHCO3 in an Alka-Seltzer Tablet, Molar Mass of CO2, and the Ideal Gas Law Constant