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### Pseudo Rate Law

Posted: 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?

### Re: Pseudo Rate Law

Posted: 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.

### Re: Pseudo Rate Law

Posted: Sat Mar 10, 2018 3:55 pm
Are there any homework problems where we use the pseudo rate law?

### Re: Pseudo Rate Law  [ENDORSED]

Posted: 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.