Kinetic Probe of Azure-b Eosin Y Reaction with Thiourea in an Acid Medium
Abstract
Kinetic probe of the azure-b eosin Y reaction with thiourea in an acid medium was executed using a spectrophotometric approach at 299 K. The reaction proceeded with the active form eosin Y that was actualized by deprotonation, leading to a decrease in reaction rate with the elevation of acid concentration. The reaction assumed a 1:1 stoichiometry (EY: TU) with the inclusion of free radical species. The concentration of the reaction species assumed first order kinetics. The reaction rate elevation was experienced in increasing the ionic strength and was decelerated as the medium polarity was altered with acetone. This demonstrated the effect of ion species distribution at the rate-controlling phase. There was a glaring catalytic effect on the inclusion of additional ion (Mg2+) to the system. The involvement of a steady intermediate moiety was ruled out as shown by kinetic evidence from the Lineweaver-Burk modification of the Michaelis-Menten plot.
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