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The Chemical Educator

ISSN: 1430-4171 (electronic version)

Table of Contents

Abstract Volume 11 Issue 6 (2006) pp 408-409

The Determination of Carbon Dioxide in Exhaled Air: A Calculator-Based Laboratory Experiment

James Gordon* and Nathaniel Barbe

Division of Science and Mathematics, Central Methodist University, Fayette, MO 65248,
Received June 25, 2006. Accepted October 9, 2006.

Published online: 1 December 2006

Abstract. A detection method using current technology was applied to a classic experiment in which gaseous carbon dioxide from exhaled air was collected in a flask and ultimately reacted with aqueous sodium hydroxide. A gas pressure sensor interfaced to a calculator-based data collection system was used to determine the percent of carbon dioxide in exhaled air. The average percent of carbon dioxide was found to be approximately 5 %.

Key Words: Laboratories and Demonstrations; general chemistry; introductory/high school chemistry; gases; calculator-based learning

(*) Corresponding author. (E-mail:

Article in PDF format (102 KB) HTML format

Supporting Materials:

The student handout and a sample Excel spreadsheet are included in a Zip file as supporting material (126 KB).

Issue date: December 1, 2006

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