Chem_215_Lect_28_Color - Method of Initial Rates 1 Measure...

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1 Method of Initial Rates 1. Measure reaction rate for a known set of initial concentrations. BrO 3 - (aq) + 5Br - (aq) + 6H + (aq) 3Br 2 (l) + 3H 2 O (l) Expt. [BrO 3 - ] [Br - ] [H + ] Initial Rate (M/s) (M) (M) (M) ___________________ 1 0.10 0.10 0.10 8.0 x 10 -4 2. Do measurement again, using one different initial concentration. 4. Vary other initial concentrations to determine their order. 3 0.20 0.10 0.20 3.2 x 10 -3 2 0.20 0.10 0.10 1.6 x 10 -3 3. Determine the order of reaction with respect to that reactant. 4 0.10 0.20 0.10 3.2 x 10 -3 Rate = k [BrO 3 - ] [Br - ] 2 [H + ]
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