00:01
To determine the order of the reaction with respect to each reactant, we need to look at the initial rate data.
00:10
We see from experiments 1 and 2 that the b concentration is staying constant, but the a concentration has been doubled when we go from experiment 2 to experiment 1.
00:24
The a concentration is doubled, going from 0 .2 to 0 .4.
00:40
When that occurs, we see that the rate is doubled.
00:49
It goes from 1 .8 in experiment 2 times 10 to the 3rd to 3 .5 times 10 to the 3rd, which is not quite doubling, but to the significant figures that they have given us, we can say that it has been doubled.
01:16
So if what we do to the concentration, we double it, we do to the rate, we double it, we say that this is first order.
01:29
Essentially, we double the concentration, we raise it to the order of one, we double the rate.
01:37
Now let's look at experiments two and three.
01:41
In experiments two and three, we see that the a concentration is constant, but the b concentration is increased five -fold.
01:54
So the concentration of b is five times.
02:01
It goes from 0 .1 to 0 .5.
02:09
And when that occurs, we see that the rate goes to 4 .5 times 10 to the 4 .5, from 1 .8 times 10 to the 3...