Lecture21, 3-3-08 Mechanisms

Lecture21, 3-3-08 Mechanisms - Color Changes, Briggs...

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Unformatted text preview: Color Changes, Briggs Rausher Reaction http://wohba.com/pages/reaction0108.html Briggs-Raucher Reaction 5 H 2 O 2 + 2 IO 3 + 2 H + > I 2 + 5 O 2 (g) + 6 H 2 O Colored I 2 is formed 5 H 2 O 2 + I 2 > 2 IO 3 + 2 H + + 4 H 2 O Colorless IO 3- is formed 10 H 2 O 2 ( l ) > 5 O 2 (g) + 10 H 2 O ( l ) Net Reaction What is reduced or oxidized in step 1 ? What is reduced or oxidized in step 2? What happens to IO 3- ? What happens to O oxidized and reduced! Reaction Mechanisms with Elementary Steps The sum of the elementary steps must add up to the balanced equation. Since the rate will be determined by the slowest elementary step, this step must be consistent with the rate law. No reaction intermediates can appear in the rate law. Fast, equilibrium steps can be used to substitute an alternate form for an intermediate. Note: reaction mechanisms are theoretical and can not be proven, only disproven! What can we say about a mechanism?...
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Lecture21, 3-3-08 Mechanisms - Color Changes, Briggs...

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