Slow step of reaction?


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J_CHEN 4I
Posts: 54
Joined: Tue Nov 14, 2017 3:01 am

Slow step of reaction?

Postby J_CHEN 4I » Thu Mar 12, 2020 4:37 pm

Is the slow step of an overall reaction determined experimentally? Can you know what the slow step is by looking at its chemical reaction?

Anika Chakrabarti 1A
Posts: 102
Joined: Sat Aug 24, 2019 12:17 am

Re: Slow step of reaction?

Postby Anika Chakrabarti 1A » Thu Mar 12, 2020 4:44 pm

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.

MingdaH 3B
Posts: 133
Joined: Thu Jul 11, 2019 12:17 am

Re: Slow step of reaction?

Postby MingdaH 3B » Thu Mar 12, 2020 4:48 pm

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.

Connie Chen 1E
Posts: 51
Joined: Mon Jun 17, 2019 7:24 am

Re: Slow step of reaction?

Postby Connie Chen 1E » Thu Mar 12, 2020 5:36 pm

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.

Jared_Yuge
Posts: 100
Joined: Sat Aug 17, 2019 12:17 am

Re: Slow step of reaction?

Postby Jared_Yuge » Thu Mar 12, 2020 7:56 pm

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.

William Chan 1D
Posts: 102
Joined: Sat Sep 14, 2019 12:15 am

Re: Slow step of reaction?

Postby William Chan 1D » Fri Mar 13, 2020 9:31 am

Yes, I think the slow step is determined experimentally in real life. Then a mechanism is proposed to match it.


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