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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, vladop@pmf.ukim.mk
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

(*) Corresponding author. (E-mail: vladop@pmf.ukim.mk)

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