00:01
In this video, we are going to use initial rate data to determine the rate of a reaction.
00:05
So we have two reactants, a and b.
00:07
We want to find the order with respect to each of them.
00:09
Let's do a first.
00:11
So we want to pick two reactions where b stays the same.
00:14
So we'll consider reactions 1 and 2.
00:17
So we don't have to worry about b affecting things because it's kept constant.
00:20
And we see that a changes by a factor of 1 3rd from 1 to 2.
00:25
And what happens to the rate of the reaction? so it goes basically from, this is like, saying 13 .5 to 1 .5, or you could just divide the overall rates.
00:38
So the rate is going down by a factor of 9.
00:48
This fraction, 1 .35 over 10 to the negative 1 over 1 .5 times 10 to negative 2, is 1 over 9.
00:57
So that means that one third to the order with respect to a, which we could call little a is equal to one -ninth.
01:10
So what does a have to be to make this true? a equals two.
01:17
Now, let's consider a situation where a is kept constant...