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The Chemical Educator
ISSN: 1430-4171 (electronic version)
Abstract Volume 28
(2023) pp 60-64
Reaction Kinetics with Flowthrough Colorimetry
John C. O’C. Young
Department of Chemistry, Saint Mary’s University, Halifax, Nova Scotia, Canada B3H 3C3, john.young@smu.ca
Received January 31, 2023. Accepted March 24, 2023.
Published: 26 March 2023
Abstract. The customary colorimetric initial and integrated rate procedures for determining kinetic reactant orders involve a significant determinate error arising from the system setup time delay before the first absorbance value is recorded after combination of the reactant solutions initiates the reaction. To eliminate this error source, a modified experimental procedure is described in which absorbance measurement is initiated from the moment that the reactant solutions are combined and an interpolation step is introduced to represent the absorbance versus reaction time relationship over the opening period before the first absorbance value of the test solution is recorded. To investigate the effectiveness of this interpolation step in eliminating experimental error, in the present study the colorimetric procedure was repeated in a test system modified to operate in a flowthrough mode to deliver absorbance values from the moment that the reactant solutions are combined.
Key Words: Laboratories and Demonstrations; general chemistry; kinetics; colorimetry; initial rate; reactant order
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