Determining Order of Rate Law. Rate = k [A] n The order of the reactants in the rate law can only be determined experimentally The initial rate is determined.

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Presentation transcript:

Determining Order of Rate Law

Rate = k [A] n The order of the reactants in the rate law can only be determined experimentally The initial rate is determined right after the reaction begins Several experiments are carried out using different initial concentrations and the rates are determined for each experiment Results are compared

NH NO 2 -  N 2 + 2H 2 O Exper. [NH 4 + ] [NO 2 - ] Rate M M 1.35x M 0.010M 2.70x M 0.010M 5.40x10 -7

We see that when the [NH 4 + ] doubles, the rate doubles – 1 st order Also see that when the [NO 2 - ] doubles, the rate doubles – 1 st order Rate = k [NH 4 + ] [NO 2 - ] What is the value of k in the previous rate law?

Given the data below write a rate law for: BrO Br - + H +  Br 2 + H 2 O Exp [BrO 3 - ] [Br - ] [H + ] Rate x x x x10 -3

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