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Topic: Kinetics  (Read 2861 times)

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Offline Fringe13

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Kinetics
« on: April 10, 2017, 09:58:50 AM »
Hello:
I ran into a question in my physical chemistry book:

"The reaction 2H2O2(aq) yields 2H2O(l) + O2(g) is catalyzed by Br- ions. If the mechanism is

H2O2(aq) + Br-(aq) yields H2O(l) + BrO- (slow)

BrO-(aq) + H2O2(aq) yields H2O(l) + O2(g) + Br-(aq) (fast)

give the order of the reaction with respect to the various participants."

I thought it would be the slowest reaction: -d[H2O2]/dt = k[H2O2][Br-]. This is second order. However, my book has the answer as H2O (l), Br- (l), and second order. Is my answer correct? Why is the book mentioning H2O(l) and Br-(l)?

Sorry, I can't use the arrows to show yields and equilibriums. When I click it, nothing appears. I also don't know how to format fractions on this site. I'm new to this site.

Offline mjc123

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Re: Kinetics
« Reply #1 on: April 10, 2017, 12:54:23 PM »
I suspect the book has a misprint, H2O for H2O2. In aqueous solution, it will be zero order with respect to H2O, even if that was involved in the RDS. Likewise I think the (l) is an error for (aq).

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