Kinetics and Mechanism of the Redox Reaction of Naphthol Green B with Hydrazine Dihydrochloride in Aqueous Acidic Medium
Science Journal of Chemistry
Volume 5, Issue 6, December 2017, Pages: 76-79
Received: Mar. 7, 2017; Accepted: Mar. 18, 2017; Published: Nov. 22, 2017
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Authors
B. Myek, Department of Chemistry, Kaduna State University, Kaduna, Nigeria
S. O. Idris, Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria
J. F. Iyun, Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria
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Abstract
The kinetics of the redox reaction between naphthol green B and hydrazine dihydrochloride has been studied in aqueous hydrochloric acid medium at an ionic strength, I = 0.50 mol dm-3(NaCl), [H+] = 1.0×10-4 moldm-3 (HCl) and T = 21±1°C. The redox reaction displayed a stoichiometry of 1:1 and obeys the rate law: -d[NGB3-]/dt=k2[NGB3-][N2H4.2HCl]. Change in hydrogen ion concentration of the reaction medium has no effect on the rate of the reaction. Added cations and anions inhibited the rate of the reaction. The redox reaction showed negative salt effect, with the rate decreasing with increase in ionic strength of the reaction medium. Results of the Michaelis–Menten’s plot show that an intermediate complex was not formed during the course of the reaction. The outersphere mechanism is proposed for this reaction.
Keywords
Kinetic, Naphthol Green B, Redox, Hydrazine Dihydrochloride, Intermediate
To cite this article
B. Myek, S. O. Idris, J. F. Iyun, Kinetics and Mechanism of the Redox Reaction of Naphthol Green B with Hydrazine Dihydrochloride in Aqueous Acidic Medium, Science Journal of Chemistry. Vol. 5, No. 6, 2017, pp. 76-79. doi: 10.11648/j.sjc.20170506.11
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Copyright © 2017 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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