Jones, Frank and Anweting, Idongesit Bassey and Okon, Idongesit Edem and Andem, Kenneth Edet (2023) Spectrophotometric Study of Kinetics of Redox Reaction between Caffeine and Permanganate Ion in Aqueous Acidic Medium. Asian Journal of Chemical Sciences, 13 (3). pp. 1-9. ISSN 2456-7795
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Abstract
The kinetics of redox reaction between caffeine (hereafter referred to as CAF) and permanganate ion [MnO4-] has been studied spectrophotometrically in aqueous sulfuric acid medium. One mole of CAF was oxidized by one mole of [MnO4-].The reaction showed first-order kinetics with respect to both [CAF] and [MnO4-]. The investigation was carried out under pseudo-first order condition atI= 0.5 mol dm–3, (Na2SO4), T = 24± 0.1℃ and [H+] = 1.0 × 10–1mol dm-3. The reaction obeys the rate law: -d[MnO4-]/dt = (a+b [H+]) [CAF ] [MnO4-]. The reaction was retarded by increased in ionic strength of the reaction medium. The rate of the reaction showed dependence on acid (in the range used).Added anions and cations were observed to catalyze the reaction rate. Spectroscopic investigation and kinetic study did not suggest intermediate complex formation. An outer–sphere mechanism is proposed for the reaction.
Item Type: | Article |
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Subjects: | South Archive > Chemical Science |
Depositing User: | Unnamed user with email support@southarchive.com |
Date Deposited: | 09 Jun 2023 05:05 |
Last Modified: | 18 Jun 2024 07:33 |
URI: | http://ebooks.eprintrepositoryarticle.com/id/eprint/1016 |