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A Simplified Determination of Percent Oxygen in Air
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Abstract
This paper presents a simplified determination of the percent oxygen in air with simple and special designed apparatus. The method is based on a consumption of oxygen resulting in reduced pressure and causing water to be drawn in to the inverted flask. This experiment should be very safe, rapid, and simple. The experiment, the combustion of ethyl alcohol with oxygen in air, can either be demonstrated by chemistry teachers or be performed easily and exactly (overall average 20.77 to 20.81 % O2) by students in the student laboratory. In this way, a fountain will be produced, utilizing the siphoning effect of reducing the pressure in the inverted flask. The maximum volume of water, which is drawn into the inverted flask from the Erlenmeyer flask below by creating an interesting fountain, is reached in 5-10 minutes.
Keywords (Audience):
First-Year Undergraduate / GeneralKeywords (Domain):
DemonstrationsKeywords (Feature):
Tested DemonstrationsKeywords (Subject):
GasesCiting Articles
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This article has been cited by 5 ACS Journal articles (5 most recent appear below).
Fractional Distillation of Air and Other Demonstrations with Condensed Gases
Maria Oliver-Hoyo and William L. Switzer III, Robert EiermanJournal of Chemical Education2005 82 (2), 251Fractional Distillation of Air and Other Demonstrations with Condensed Gases
Maria Oliver-Hoyo and William L. Switzer III, Robert EiermanJournal of Chemical Education2005 82 (2), 251This demonstration builds upon the commonly performed liquefaction of air not only to show the presence of nitrogen and oxygen, but also the presence of two other components, carbon dioxide and water. Several extensions are suggested: one to show boiling ...
Incomplete Combustion with Candle Flames: A Guided-Inquiry Experiment in the First-Year Chemistry Lab
Joseph MacNeil , Lisa VolaricJournal of Chemical Education2003 80 (3), 302Incomplete Combustion with Candle Flames: A Guided-Inquiry Experiment in the First-Year Chemistry Lab
Joseph MacNeil , Lisa VolaricJournal of Chemical Education2003 80 (3), 302The self-extinction of candle flames in sealed environments is used as the foundation of a guided-inquiry module suitable for first-year chemistry labs. Working in groups of three or four, students are introduced to gas chromatography by resolving and ...
"Experiment with a Candle" without a Candle
Dusan Krnel and Sasa A. GlazarJournal of Chemical Education2001 78 (7), 914"Experiment with a Candle" without a Candle
Dusan Krnel and Sasa A. GlazarJournal of Chemical Education2001 78 (7), 914In the popular experiment in which a burning candle in an airtight cylinder purports to demonstrate the percentage of oxygen in the air, the main reason for the change in volume is the expansion and contraction of gases because of warming up or cooling ...
Paradoxes, Puzzles, and Pitfalls of Incomplete Combustion Demonstrations
Ed VitzJournal of Chemical Education2000 77 (8), 1011Paradoxes, Puzzles, and Pitfalls of Incomplete Combustion Demonstrations
Ed VitzJournal of Chemical Education2000 77 (8), 1011In this demonstration, paper is burned in a closed container containing sufficient oxygen to consume all the paper by the reaction (C6H10O5)n + 6nO2 ---> 6nCO2 + 5nH2O.Paradoxically, the flame expires while half of the paper remains. This demonstrates ...
The Persistence of the Candle-and-Cylinder Misconception
James P. Birk , Anton E. LawsonJournal of Chemical Education1999 76 (7), 914The Persistence of the Candle-and-Cylinder Misconception
James P. Birk , Anton E. LawsonJournal of Chemical Education1999 76 (7), 914<p>There is a persistent misconception that when a lighted candle is supported in a container of water and a closed cylinder is lowered over the candle, the candle is extinguished after a time by complete consumption of the oxygen in the cylinder, with a ...
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- Received: August 03, 2009
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