Chem_215_Lect_28_Color

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 - ][ B r - 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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2 Zero-Order Reactions • Sum of exponents m + n +…. = 0 • Most common for unimolecular decomposition: A products Rate = k[A] 0 = k = constant Slope = -k k in units of M/s Integrated Rate Law: [A] t = [A] o -kt
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3 First-Order Reactions • Sum of exponents m + n +…. = 1 • Most common for unimolecular decomposition and radioactive decay. A products Rate = k[A] 1 = k[A] Slope of [A] vs. t is not constant.
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4 First-Order Reactions Rate = k[A] Integrated Rate Law: ln[A] t = ln[A] o -kt Slope = -k k in units of s -1 [A] t =[A] o e -kt
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5 Second-Order Reactions • Sum of exponents m + n +…. = 2
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This note was uploaded on 03/05/2009 for the course CHEM 2150 taught by Professor Chirik,p during the Fall '08 term at Cornell.

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Chem_215_Lect_28_Color - Method of Initial Rates 1. Measure...

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