### k

Posted:

**Wed Mar 07, 2018 2:56 am**How exactly do we use the slope of a reaction graph to determine the rate constant k?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=146&t=29147

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Posted: **Wed Mar 07, 2018 2:56 am**

How exactly do we use the slope of a reaction graph to determine the rate constant k?

Posted: **Wed Mar 07, 2018 7:59 am**

This depends on what order of reaction you are plotting. If the reaction is zero order, then you plot [A]_{t} vs. t and the slope should equal -k. For first order, you would plot ln[A]_{t} vs. t and the slope is -k. 2nd order, 1/[A]_{t} vs. t plots yield a slope of k itself.

Posted: **Wed Mar 07, 2018 10:39 pm**

because your integrated rate laws can be viewed in the form of y=mx+b and k is in the place of m, you regard k as your slope. depending on the order, k will be positive or negative.