Oxidation of oxalic acid by ammonium metavanadate in aqueous Kcl solutions Cyclic Voltammetrically

Gomaa, Esam A.; Abdel Hady, Mahmoud Nabil; Mahmoud, Mahmoud Hanfy; El-shahat, Mona A.

doi:10.21608/mjcc.2020.412850

	Oxidation of oxalic acid by ammonium metavanadate in aqueous Kcl solutions Cyclic Voltammetrically
Mansoura Journal of Chemistry
Volume 47, Issue 1, February 2020, Page 17-21 PDF (881.67 K)
Document Type: Original Article
DOI: 10.21608/mjcc.2020.412850
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Authors
Esam A. Gomaa^* ¹; Mahmoud Nabil Abdel Hady¹; Mahmoud Hanfy Mahmoud²; Mona A. El-shahat¹
¹Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.
²Physics and Mathematical Engineering Department, Faculty of Engineering, Mansoura, Egypt.
Abstract
In the present work, the oxidation behavior of oxalic acid with NH₄VO₃ was examined via cyclic voltammetry in KCl aqueous solution. The cyclic voltammetry gave a reversible redox couple of waves for NH₄VO₃ in the absence and presence of oxalic acid due to the reduction effect of +5 vanadium ion to +4 one. Also, the oxidation effect was discussed by the oxidation peak in the reverse direction. The positive shift in the potential of both the oxidation and reduction peaks of NH₄VO₃ in the presence of oxalic acid supports the oxidation mechanism. The oxidation stability constants and Gibbs free energies of oxidation resulting from the interaction of NH₄VO₃ on oxalic acid were evaluated and their data were discussed.
Keywords
Oxalic acid; oxidation; ammonium metavanadate; oxidation stability constant; Gibbs free energy of complexation


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