Hydrogen peroxide reacts with thiosulfate ion in slightly acidic solution as follows:H2O2+2S2O3²ˉ+2H+→2H2O+S4O6²ˉ
This reaction rate is independent of the hydrogen ion concentration in the pH range 4 to 6. The following data were obtained at 25°C and pH5.0. Initial concentrations: [H2O2]= 0.036molLˉ¹;[S2O2−3]=0.02040molL ˉ¹.
t/min 16 36 43 52 [S2O3²ˉ]/10ˉ³molL ˉ¹10.305.184.163.13
(a) What is the order of the reaction?
(b) What is the rate constant?
