Consider the curve shown here for the titration of a weak base with a strong acid and answer each question.

c. At what volume of added acid does pH = 14 - pK_b?

Video transcript

Hey everyone today, we're given a taxation curve where a weak monochromatic base is tight traded with a strong acid and were asked to determine the volume of the added acid where the ph is equal to minus P K B. Now, as a rule of thumb, we can also say that ph ph halfway to the equivalence point, halfway to eq point E q point is equal to 14 - the PKB, which equals the p K A of the base. So this means if we're looking for the ph of halfway to the equivalence point, while the equivalence point falls right here, equivalence point falls right here and the ph that is half the equivalence point. Well, if this is, let's say this is about 16, well, the ph and volume will therefore have to be here about eight millimeters with a ph of 10. Therefore, the volume of the added acid at where the ph is equal to 14 minus the PKB is eight mL. I hope this helps. And I look forward to seeing you all in the next one.