00:01
Okay, so the ph of a .12 molar solution of arsenic acid is measured to be 1 .64.
00:06
It uses information to determine the value of k .a.
00:09
You're going to use an ice chart for this.
00:15
Remember that water is a liquid, so it does not matter for your ice chart.
00:19
And we have a 0 .12 molar solution of the acid to begin with, and none of the ions to begin with.
00:28
So because they're at zero, you can't go down from zero, so it has to go up.
00:32
And then you're going to use the coefficients from the balanced equation, so they're all one.
00:37
So those will increase by one, which means the reactant side must decrease by 1 x.
00:45
Now, they told us that the ph is 1 .64.
00:48
If we do 10 to the negative 1 .64, we can find the hydrogen ion concentration, which is 0 .029...