Little Product

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Frenz Cabison 1B
Posts: 54
Joined: Fri Sep 29, 2017 7:07 am

Little Product

Postby Frenz Cabison 1B » Sun Mar 04, 2018 9:15 pm

I was looking through my notes and in one of the lecture slides, it says that it is easier to study initial rate when very little product is present. Why is this the case?

Harjas Sabharwal 1G
Posts: 42
Joined: Sat Jul 22, 2017 3:01 am

Re: Little Product

Postby Harjas Sabharwal 1G » Sun Mar 04, 2018 9:36 pm

If product is present then it can influence the reaction rate. Hence, we study the initial rates (when little to no product has formed) so that we can ignore the effects of products on the reaction rate.

Rachel Formaker 1E
Posts: 86
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 2 times

Re: Little Product

Postby Rachel Formaker 1E » Sun Mar 04, 2018 9:54 pm

When there is product present, the product will also be reacting to form reactant. So this reverse reaction would occur in addition to reactant forming product, changing the overall rate at which reactant is consumed and product is formed.

We therefore use initial rates to avoid having to calculate anything about the reverse reaction.

Isaiah Little 1A 14B
Posts: 50
Joined: Fri Sep 29, 2017 7:05 am

Re: Little Product

Postby Isaiah Little 1A 14B » Sun Mar 04, 2018 10:13 pm

For reactions with multiple reactants, we also tend to use a small amount of one reactant and excess of the other reactants in order to study the order of each reactant. For example, in a reaction A + B + C ====> D, we would use A and C in excess and a small amount of B to determine its order with respect to its concentration.

Michelle Dong 1F
Posts: 110
Joined: Fri Sep 29, 2017 7:04 am

Re: Little Product

Postby Michelle Dong 1F » Tue Mar 06, 2018 5:38 pm

This is why we study initial rates, because initially, there is little to no product and everything is in terms of the reactants. That's why for our differential rate law, the species in it are all for reactants.

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