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    Abstract
2011 (Vol. 3, Issue: 10)
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 

Key words:  Kinetics, mechanism, nitrite ion, pyrocatechol violet, , ,
Vol. 3 , (10): 1159-1163
Submitted Accepted Published
2011 July, 20 2011 September, 07 2011 October, 20
Abstract:

The kinetics of the oxidation of Pyrocatechol violet (PCVH) by nitrite ion (NO2-) in aqueous acidic medium has been studied at 241C, I = 0.50 mol/dm3(NaCl), [H+] = 1.010-3 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-]. 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.
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  Cite this Reference:
A. Adetoro, J.F. Iyun and S.O. Idris, 2011. 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, 3(10): 1159-1163.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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