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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 16 (2011) pp 129-131

On the Oxygen Content of Air: An Alternative Determination Using Digital Manometer

Vladimir M. Petruševski* and Nataša Stavrevska

Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss Cyril and Methodius University, Arhimedova 5, PO Box 162, 1000 Skopje, Republic of Macedonia,
Received January 12, 2011. Accepted March 1, 2011.

Published: 26 May 2011

Abstract. In order to determine the oxygen content in the air, an excess of alkaline solution of pyrogallol was placed in a reaction chamber connected to a digital manometer. The reaction is completed in less than 24 hours, the determined oxygen content is in perfect agreement with the widely adopted value of 21 % by volume. Also the process follows, almost ideally, a first order kinetics.

Key Words: Laboratories and Demonstrations; general chemistry

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