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

c. At what volume of added base does pH = pK_a?

Video transcript

Hey everyone. So today we're being asked to determine the volume of added base where the ph is equal to the PK A. For the titillation of a mono product, acid tie traded with a strong base and were given the titillation curve here. So the answer to this will actually be wherever the half equivalence point on the titillation curve lies. And this is because that half equivalence point represents the point at which exactly half exactly half of the acid in this solution, which is a buffer solution. It's a buffer solution. At the moment, solution has reached equivalents equivalence. It is at this point that P H. Will be equal to the P. K. A. Of the weak acid to the P. K. So let's identify the half equivalence point. Well, it falls about right here since equivalence happens about mm. Then the Half of that will be right about here. Falling at nine middle leaders. Where PK. Is about six, therefore the volume of the ph or where the ph is equal to the P. K. Of the weak acid is nine or about nine millimeters. About nine millimeters. I hope this helps. And I look forward to seeing you all in the next one