## Catalysts

Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$

Delaney Smith 1C
Posts: 52
Joined: Thu Feb 28, 2019 12:15 am

### Catalysts

How can you determine the catalyst by looking at the reaction? For example in 7E.5, how do you know the catalyst in this reaction?

Julie Park 1G
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

### Re: Catalysts

A catalyst will be present in the beginning of the reaction (in reactants) but will be consumed in the reaction and thus will not appear in the final product. In 7E.5, the hydroxide ion (OH-) serves as the catalyst since it's present in the reactant of step 1 and in the product of step 2 (cancelling each other out).

Ariel Fern 2B
Posts: 105
Joined: Fri Aug 30, 2019 12:17 am

### Re: Catalysts

Yes, essentially, a catalyst will be consumed as a reactant but reproduced again as a product in the final step. Thus, it cancels out and does not show up in the overall reaction. Just look at the products and reactants between steps; if a substance is consumed but reappears, then it is a catalyst! Hope this helps!

Sydney Myers 4I
Posts: 100
Joined: Fri Aug 09, 2019 12:17 am

### Re: Catalysts

It must be introduced as a reactant, as opposed to an intermediate, which is produced as a product first, then maybe used as a reactant. Catalysts also must reappear as products in equal amount as was inputted.

Ayushi2011
Posts: 101
Joined: Wed Feb 27, 2019 12:17 am

### Re: Catalysts

It is introduced as a reactant, and then produced as a product in the following equations showing that it remains unconsumed in the reaction.

Norman Dis4C
Posts: 101
Joined: Sat Sep 28, 2019 12:16 am

### Re: Catalysts

A catalyst is used up and formed and an intermediate is formed and used up.