00:01
If we have a solution that contains ammonium chloride, the ammonium is an acid, and the chloride does not do anything to affect the ph.
00:17
So this solution is acidic originally, or the ph is going to be less than 7.
00:25
So in order to bring this up to a ph of 7, we need to add something basic.
00:32
So we're not going to add 12 molar hcl.
00:35
That'll make it even more acidic.
00:38
We need to add 12 -molar ammonia, ammonia being the conjugate base to ammonium.
00:49
To figure out how much we need to add, we'll use the henderson -hasselbaltz equation.
00:55
We want the ph to be 7 .00.
01:01
The rest of the henderson -hassel -baltz equation is ph equals p -ka.
01:06
That's going to be the p -ka value...