Abstract

The kinetics for the reaction between potassium ferricyanide (K3Fe(CN)6) and cobalt chloride (CoCl2) in aqueous solution and water/bis(2-ethylhexyl) sodium sulfosuccianate (AOT)/isooctane microemulsions were studied by three-wavelength spectrophotometry at 298.2 K. The second-order rate constants (k2) were calculated from the time dependence of the concentration of reactant K3Fe(CN)6. The result showed that the reaction rates in water/AOT/isooctane microemulsions were slower than that in the aqueous solution, and k2 decreased with molar ratio (ω) of water to AOT in microemulsions, which was interpreted by the transition state theory and confirmed that the reaction took place at the interfaces of the microemulsion water pools.

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