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Kinetics and mechanism of the oxidation of hydroxylammonium ion by gold(III) in hydrochloric acid medium

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Summary

The kinetics of the oxidation of hydroxylammonium ion by gold(III) have been studied spectrophotometrically in hydrochloric acid medium. Hydrogen ion inhibits the oxidation. The empirical rate expression in the hydrochloric acid concentration range 0.1 – 1.0 M is

$$ - \frac{{{\text{d[Au}}^{{\text{III}}} {\text{]}}}}{{{\text{dt}}}}{\text{ = k}}_{{\text{sp}}} {\text{ }}\frac{{{\text{[Au}}^{{\text{III}}} {\text{] [NH}}_{\text{3}} {\text{OH}}^{\text{ + }} {\text{]}}}}{{{\text{[H}}^{\text{ + }} {\text{]}}}}$$

At 30°C, the value of ksp is (4.22 ± 0.15) × 10−4 s−1. The oxidation appears to proceed through the initial reaction between NH3OH+ and AuCl −4 and subsequently through free radicals.

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Authors and Affiliations

  1. Department of Chemistry, Jadavpur University, 700032, Calcutta, India

    Kalyan Kali Sen Gupta & Biswanath Basu

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  1. Kalyan Kali Sen Gupta
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  2. Biswanath Basu
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Sen Gupta, K.K., Basu, B. Kinetics and mechanism of the oxidation of hydroxylammonium ion by gold(III) in hydrochloric acid medium. Transition Met Chem 8, 6–7 (1983). https://doi.org/10.1007/BF00618786

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  • DOI: https://doi.org/10.1007/BF00618786

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