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Kinetic Approach to the Mechanism of Redox Reaction of Pyrocatechol Violet and Nitrite Ion in Aqueous Hydrochloric Acid
並列摘要
The kinetics of the oxidation of Pyrocatechol violet (PCVH) by nitrite ion (NO_2^-) in aqueous acidic medium has been studied at 24±1°C, I=0.50 mol/dm^3(NaCl), [H^+]=1.0×10^3 mol/dm^3. The reaction is first order to [PCVH] and half order to [NO_2^-]. The redox reaction displayed a 1:1 stoichiometry and obeys the rate law: d[PCVH]/dt=(a+b[H^+])[PCVH][NO_2^-]^(1/2). 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.
延伸閱讀
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