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Slow step of reaction?

Posted: Thu Mar 12, 2020 4:37 pm
by J_CHEN 4I
Is the slow step of an overall reaction determined experimentally? Can you know what the slow step is by looking at its chemical reaction?

Re: Slow step of reaction?

Posted: Thu Mar 12, 2020 4:44 pm
by Anika Chakrabarti 1A
I think if you know the overall rate law that was determined experimentally, then the rate law of the slow step will be the same as the reaction rate law. You also might need to use the pre-equilibrium method if the rate law of the slow step has an intermediate.

Re: Slow step of reaction?

Posted: Thu Mar 12, 2020 4:48 pm
by MingdaH 3B
depending on a reaction, you may be able to guess what the slow step is just by looking at its chemical reaction. The slow step of an overall reaction is usually determined experimentally.

Re: Slow step of reaction?

Posted: Thu Mar 12, 2020 5:36 pm
by Connie Chen 1E
The slow step of a reaction can also be determined experimentally as the textbook does mention that some techniques such as the stopped-flow technique or spectrometry can be used to measure the rate of fast reactions.

Re: Slow step of reaction?

Posted: Thu Mar 12, 2020 7:56 pm
by Jared_Yuge
You would need to run the experiment, and then check with the pre equilibrium method to confirm. In the test the slow step will most likely be given.

Re: Slow step of reaction?

Posted: Fri Mar 13, 2020 9:31 am
by William Chan 1D
Yes, I think the slow step is determined experimentally in real life. Then a mechanism is proposed to match it.