## First Order Reaction

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

Jessica Helfond 2F
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

### First Order Reaction

If [A]₀ is the initial concentration of A, then what does [A] represent?

Vincent Li 4L
Posts: 48
Joined: Fri Sep 28, 2018 12:19 am

### Re: First Order Reaction

[A] is assumed to represent the concentration of A at some time t, or the time that elapsed since the reaction began.

Kelsey Warren 1I
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

### Re: First Order Reaction

[A] is just the concentration of the reactant A at any time t throughout the reaction, whereas [A]o is the concentration exactly at the beginning of the reaction.

Max Hayama 4K
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

### Re: First Order Reaction

Given that we have the initial concentration of A, or [A]o, [A] is the concentration of A after some time, t.