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Abstract
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Article Information:
Kinetic Approach to the Mechanism of Redox Reaction of Pyrocatechol Violet and Nitrite Ion in Aqueous Hydrochloric Acid
A. Adetoro, J.F. Iyun and S.O. Idris
Corresponding Author: Adetoro Ahmed
Submitted:
Accepted: 2011 September, 07
Published: 2011 October, 20 |
Abstract:
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The kinetics of the oxidation of Pyrocatechol violet (PCVH) by nitrite ion (NO2-) in aqueous acidic
medium has been studied at 24±1ºC, I = 0.50 mol/dm3(NaCl), [H+] = 1.0×10-3 mol/dm3. The reaction is first
order to [PCVH] and half order to [NO2-]. The redox reaction displayed a 1:1 stoichiometry and obeys the rate
law: d[PCVH]/dt = (a + b[H+]) [PCVH][NO2-]½. The second-order rate constant increases with increase in acid
concentration and ionic strength. This system displayed positive salt effect while spectroscopic investigation
and Michaelis-Menten plot showed evidence of intermediate complex formation in the course of the reaction.
A plausible mechanism has been proposed for the reaction.
Key words: Kinetics, mechanism, nitrite ion, pyrocatechol violet, , ,
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Cite this Reference:
A. Adetoro, J.F. Iyun and S.O. Idris, . Kinetic Approach to the Mechanism of Redox Reaction of Pyrocatechol Violet and Nitrite Ion in Aqueous Hydrochloric Acid. Research Journal of Applied Sciences, Engineering and Technology, (10): 1159-1163.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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