Question

Kinetics of Fe(III)-catalyzed decomposition of hydrogen peroxide When Fe3+ is added into the solution containing H2O2, the decomposition of H2O2 is accelerated by the catalytic reactions as follows. Also, the decomposition rate of H2O2 follows the pseudo-first order kinetics (i.e., d[H2O2]/dt = – kH2O2[H2O2]) . Derive the pseudo-first order rate constant for the decomposition of H2O2 (kH2O2) using the second-order rate constants of the elementary reactions below (k1 ~ k5) and the concentration of Fe3+ ([Fe3+]) Fe3+ + H2O2 ? Fe2+ + HO2• + H+ k1 Fe2+ + H2O2 ? Fe3+ + •OH + OH– k2 HO2• + Fe3+ ? Fe2+ + O2 + H+ k3 HO2• + Fe2+ ? Fe3+ + HO2– (? H2O2) k4 H2O2 + •OH ? HO2• + H2O k5 (Use steady-state approximations for the intermediates)

          Kinetics of Fe(III)-catalyzed decomposition of hydrogen peroxide
When Fe3+ is added into the solution containing H2O2, the decomposition of H2O2 is accelerated by the catalytic reactions as follows. Also, the decomposition rate of H2O2 follows the pseudo-first order kinetics (i.e., d[H2O2]/dt = – kH2O2[H2O2]) .
Derive the pseudo-first order rate constant for the decomposition of H2O2 (kH2O2) using the second-order rate constants of the elementary reactions below (k1 ~ k5) and the concentration of Fe3+ ([Fe3+])

Fe3+ + H2O2 ? Fe2+ + HO2• + H+	k1
Fe2+ + H2O2 ? Fe3+ + •OH + OH–	k2
HO2• + Fe3+ ? Fe2+ + O2 + H+	k3
HO2• + Fe2+ ? Fe3+ + HO2– (? H2O2)	k4
H2O2 + •OH ? HO2• + H2O	k5

(Use steady-state approximations for the intermediates)

Kinetics of Fe(III)-catalyzed decomposition of hydrogen peroxide
When Fe3+ is added into the solution containing H2O2, the decomposition of H2O2 is accelerated by the catalytic reactions as follows. Also, the decomposition rate of H2O2 follows the pseudo-first order kinetics (i.e., d[H2O2]/dt = – kH2O2[H2O2]) .
Derive the pseudo-first order rate constant for the decomposition of H2O2 (kH2O2) using the second-order rate constants of the elementary reactions below (k1 k5) and the concentration of Fe3+ ([Fe3+])

Fe3+ + H2O2 ? Fe2+ + HO2• + H+ k1
Fe2+ + H2O2 ? Fe3+ + •OH + OH– k2
HO2• + Fe3+ ? Fe2+ + O2 + H+ k3
HO2• + Fe2+ ? Fe3+ + HO2– (? H2O2) k4
H2O2 + •OH ? HO2• + H2O k5

(Use steady-state approximations for the intermediates)

Added by Marilyn A.

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