Pseudo Rate Law  [ENDORSED]

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Nancy Le - 1F
Posts: 52
Joined: Fri Sep 29, 2017 7:07 am

Pseudo Rate Law

Postby Nancy Le - 1F » Fri Mar 09, 2018 10:12 pm

The pseudo rate law is the rate law in between elementary steps, but under what conditions would we need to use this?

Mika Sonnleitner 1A
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Joined: Fri Sep 29, 2017 7:04 am
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Re: Pseudo Rate Law

Postby Mika Sonnleitner 1A » Fri Mar 09, 2018 11:04 pm

Pseudo rate laws are used essentially when the order is determined by increasing the concentrations of one or more reactants. For example, in the rate law Rate=k[A][B][C], if [B] and [C] are in large excess, then they remain essentially constant, so [A] determines the rate. Since only [A] matters in this case, the reaction would be pseudo first order; it is first order when considering only [A], but because there are two other concentrations involved that don't technically matter in the rate law, it is called a psuedo first order reaction.

Michael Cheng 1C
Posts: 51
Joined: Thu Jul 13, 2017 3:00 am

Re: Pseudo Rate Law

Postby Michael Cheng 1C » Sat Mar 10, 2018 3:55 pm

Are there any homework problems where we use the pseudo rate law?

Kayla Danesh 1F
Posts: 38
Joined: Thu Jul 13, 2017 3:00 am

Re: Pseudo Rate Law  [ENDORSED]

Postby Kayla Danesh 1F » Sat Mar 10, 2018 5:17 pm

Problem 15.30 is a pseudo-rate law problem. I think we mostly just need to understand this topic conceptually though.

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