International Journal of Chemical Kinetics p. 359 - 366 (2004)
Update date:2022-08-11
Topics:
Khan, Zaheer
Raju
Akram, Mohd
Kabir-Ud-Din
Spectrophotometric method has been used to characterize water-soluble colloidal manganese dioxide obtained by the redox reaction between sodium thiosulphate and potassium permanganate in neutral aqueous medium which shows a single peak in the visible region with λmax = 425 nm. The kinetics of the oxidation of lactic acid by colloidal manganese dioxide (oxidant) has been investigated spectrophotometrically under pseudo-first-order conditions of excess lactic acid. The rate of the noncatalytic reaction pathway was slow which increased with increasing lactic acid concentration. The reaction was first-order with respect to [oxidant] as well as [lactic acid]. In presence of manganase(II) and fluoride ions, the noncatalytic path disappeared completely while the oxidation rate of autocatalytic path increased and decreased, respectively with increasing [Mn(II)] and [F-]. A mechanistic scheme in conformity with the observed kinetics has been proposed with the rate-law: v = -d[MnO2]/dt = κ1κ2[MnO2] [H+][lactic acid]T/ ([H+] Ka)(κ_1 + ≤2)
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