00:01
Alright, so we have some questions about this titration curve.
00:03
First, for part a, are we titrating an acid or a base? well, we can see here that the starting ph is greater than 7, it's at 10.
00:14
So if it's greater than 7, that means that we are titrating a base because its initial ph is in the basic range.
00:23
And then is it strong or weak? well, the ph is 10, right? so if it was a strong base, then we would expect the initial ph to be closer to 14.
00:34
But since it's, you know, in between 7 and 14, that means it is a weak base.
00:44
Alright, and then for part c, what is the value of, in this case, kb because we're dealing with a base? well, we know that the ph at half equivalence is equal to the pka or a pkb by henderson -hasselbalch.
01:06
In this case, we're using pkb.
01:08
So the equivalence point is halfway along this vertical line here, so right about here, which is 20 milliliters of titrant...