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

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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)

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:

Suggested Citation

  • PATRICIA ESE UMORU & Udoh Ini Effiong, 2022. "Kinetics and Mechanism of the Reduction of Tartrazine by Nitrite Ion in Aqueous Acid Phase," Academic Journal of Chemistry, Academic Research Publishing Group, vol. 7(1), pages 10-16, 03-2022.
    • Handle: RePEc:arp:ajcarp:2022:p:10-16
    DOI: 10.32861/ajc.71.10.16
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    Keywords

    Kinetics; Tartrazine; Nitrite.;
    All these keywords.

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