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Kinetics of the bromate–bromide reaction at high bromide concentrations

✍ Scribed by Guy Schmitz

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
216 KB
Volume
39
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

At bromide concentrations higher than 0.1 M, a second term must be added to the classical rate law of the bromate–bromide reaction that becomes −d[BrO~3~^−^]/d__t__ = [BrO~3~^−^][H^+^]^2^(k~1~[Br^−^] + k~2~[Br^−^]^2^). In perchloric solutions at 25°C, k~1~ = 2.18 dm^3^ mol^−3^ s^−1^ and k~2~ = 0.65 dm^4^ mol^−4^ s^−1^ at 1 M ionic strength and k~1~ = 2.60 dm^3^ mol^3^ s^−1^and k~2~ = 1.05 dm^4^ mol^−4^ s^−1^ at 2 M ionic strength. A mechanism explaining this rate law, with Br~2~O~2~ as key intermediate species, is proposed. Errors that may occur when using the Guggenheim method are discussed. © 2006 Wiley Periodicals, Inc. Int J Chem Kinet 39: 17–21, 2007

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