00:01
Hello.
00:03
So this question is about the ph of a solution.
00:06
Okay.
00:08
So before we get into the ph, we need to do a number of things.
00:14
So, and of course we're going to be using the henderson hattelbach equation.
00:20
And we've been given the constant of kittner's baby pneumonia to be 1 .8 times 10 10 to and every 5.
00:36
So we have to find the p .o .h first before we get a ph.
00:40
So what is the p of h equation? so the p of h is given by p kb plus log of the concentration of the salt, right? we've got the concentration of the base.
01:12
All right.
01:16
So let's first get the pkb of ammonia because we don't have pkb, you only have the kb.
01:24
So the p kb ammonia is going to be negative log of the kb.
01:45
So that is going to be equal to negative log of 1 .8.
01:52
That is 20 negative 5.
01:56
And that is going to give 4 .744.
02:05
Okay.
02:07
On the next step, we were giving the individual concentrations of the salt in the base.
02:12
And we need to get their concentrations in the solution.
02:16
Let's get a total volume of this solution.
02:27
The volume of the ammonia was 250 and that of the ammonium clavite was also 250.
02:39
We've got 250 plus 250 plus 500 millimeters.
02:48
Now let's look for the concentration of the ammonium chloride in the solution.
03:00
So let's find in solution.
03:18
This is what this is about.
03:20
So we are finding these two.
03:24
So now let's do the ammonium chloride.
03:28
We'll use the dilution formula.
03:35
So initially the concentration of the ammonium chloride was given at 0 .9.
03:41
And its volume was 250.
03:45
Now we want to find the concentration in the solution, which is 250.
03:55
Oops, not 250, 500.
04:02
This is 250...