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

d. At what volume of added base is the pH calculated by working an equilibrium problem based on the concentration and K_b of the conjugate base?

Video transcript

Hey everyone. So today we're being asked to determine the volume of added base where the ph is used for calculations of equilibrium problems involving the KB and concentration of conjugate, based based on the type curve that were given for a mono protic acid being tight traded with a strong base. Now this question stem is pretty long, it's very wordy. But essentially what is asking us is, what is the volume? What is the volume where all of the base? All of the base has been converted, converted to conjugate base or sorry, when all the asset has been converted to conjugate base, all acid has been converted to its conjugate base or in other words, where the KB comes into play and this point is better known. I have acid has all become conjugate base. But this point is better known as the equivalence point. So all this big word he talk is essentially asking us at what volume does the titillation reach its equivalent point. So with that in mind, let's go ahead and take a look at the tire rotation curve once again. So we know just simply identifying off of it. The equivalence point is where there is a very sharp change in ph and then specifically it will be at the center of that change. So that happens here at about a ph of nine and at about 18 middle leaders, therefore, the volume Of the equivalence point, which I'll denote with EP is 18 million L. I hope this helps. And I look forward to seeing you all in the next one