00:01
If we're preparing a buffer solution, we can use the henderson -hasselbalch equation, which is ph equals pka plus the log of...
00:10
A lot of people really like to use concentration base over the concentration of the acid, but in most cases it's easier to use a ratio of moles rather than a ratio of molarities.
00:25
So we should be using moles of the base over moles of the acid, and we'll get the same answer.
00:38
So the ph of the buffer solution prepared is simply equal to pka, which they gave us at 10 .32.
00:48
We then add to that the log of...
00:51
The volume doesn't matter.
00:53
We just need the moles of the base.
00:55
That's the sodium carbonate, 1 .5, divided by the moles of the acid, the sodium hydrogen carbonate, at 1 .0, and we get 10 .496 or 10 .50...