## Integrated Rate Law

$\frac{d[R]}{dt}=-k[R]; \ln [R]=-kt + \ln [R]_{0}; t_{\frac{1}{2}}=\frac{0.693}{k}$

Mya Majewski 1L
Posts: 89
Joined: Fri Sep 25, 2015 3:00 am

### Integrated Rate Law

How do you know whether to use the exponential decay 1st rate law or the regular integrated rate law? For example, in the 6th edition 15.25.

MackenziePerillo-1L
Posts: 31
Joined: Fri Sep 28, 2018 12:19 am

### Re: Integrated Rate Law

I believe that the regular integrated rate law usually works with problems that have set concentrations and a set amount of time, where you are manipulating known variables to solve for an unknown in the problem. I believe the exponential decay formula you are referring to might be a derivation/manipulation of the regular integrated rate law. What is the exact formula you are referring to?