00:01
So we want to buffer with the ph equal to 4 .75.
00:08
So that means that the p -k -a of the acid should be close to 4 .75.
00:14
So let's look at our choices here.
00:17
We have chloros acid, which is in a, that's h -c -l -o -2, k -a value, equal to 1 .1 times 10 of the minus 2.
00:31
P -k -a, it's negative log, 1 .1 times 10 to the minus 2.
00:39
That gives me 1 .96, so that's, this is our target value here, 4 .75, so that's not very good, so it doesn't look like that's going to work.
00:49
Hydrofluic acid, ka is 6 .6 times 10 of the negative 4.
00:57
P -ka, it's negative log, 6 .6 times 10 to the negative 4...