Kinetics and Mechanism of the Reduction of Tartrazine by Nitrite Ion in Aqueous Acid Phase

Patricia Ese Umoru and Udoh Ini Effiong
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Patricia Ese Umoru: Department of Chemistry, Nigerian Defence Academy, P.M.B 2109, Nigeria
Udoh Ini Effiong: Department of Chemistry, Nigerian Defence Academy, P.M.B 2109, Nigeria

Academic Journal of Chemistry, 2022, vol. 7, issue 1, 10-16

Abstract: Kinetics and mechanism of the reduction of tartrazine (TZ+) by nitrite ion (NO2-) was conducted in aqueous acidic phase under pseudo-first order condition in excess of [NO2-] at T = 28 ± 1°C, [H+] = 1 × 10-4 mol/dm3, ?max = 560 nm and ionic strength I = 1.0 mol/dm3 (NaCl). The stoichiometry of the reaction displayed 1:2 mole ratio for tartrazine and nitrite ion. The redox reaction was first order with respect to [TZ+] and first order with respect to [NO2-]. A second order rate constant was observed for the reaction. The rate also shows first order dependence on acid ion concentration. The overall reaction conforms to the rate law:

Keywords: Kinetics; Tartrazine; Nitrite. (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:arp:ajcarp:2022:p:10-16

DOI: 10.32861/ajc.71.10.16

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