## Psuedo First Order

Giselle1B
Posts: 26
Joined: Fri Sep 28, 2018 12:19 am

### Psuedo First Order

What is psuedo first Order and how is it related to the first order process?

Ariel Cheng 2I
Posts: 67
Joined: Fri Sep 28, 2018 12:29 am

### Re: Psuedo First Order

A pseudo first order reaction is like a second order reaction that acts like a first order reaction under certain conditions.

Douglas Nguyen 2J
Posts: 71
Joined: Fri Sep 28, 2018 12:15 am

### Re: Psuedo First Order

A pseudo rate is considered when there are too many changing concentrations. For instance, it is difficult to calculate the rate when you have k[A][B], and both A and B are changing. As such, you make one significantly larger so that the rate becomes dependent on only the other.

For this example, let's say [A] is significantly larger than [B]. Because of that, the pseudo rate is k'=[B]

Eesha Sohail 1D
Posts: 100
Joined: Sat Aug 17, 2019 12:16 am

### Re: Psuedo First Order

So this concept is generally used in the gathering of experimental data?

Noe BM 1J
Posts: 50
Joined: Sat Sep 07, 2019 12:17 am

### Re: Psuedo First Order

Is the rate always going to depend on the reactant with smallest concentration?

Douglas Nguyen 2J wrote:A pseudo rate is considered when there are too many changing concentrations. For instance, it is difficult to calculate the rate when you have k[A][B], and both A and B are changing. As such, you make one significantly larger so that the rate becomes dependent on only the other.

For this example, let's say [A] is significantly larger than [B]. Because of that, the pseudo rate is k'=[B]