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

a. What is the pH and what is the volume of added acid at the equivalence point?

Video transcript

hi everyone for this problem. It reads the image below shows the tip tray shin of a weak base with a strong acid. How much acid was added for the equivalence point to be reached. And what is the ph at this point? So we have a two part question here and were given an image. So let's take a look at our graph. We have ph on our Y axis and we have volume on our X axis. And we're being asked about equivalence point here. So what equivalence point is is the equivalence point of a tight rations is where the ph drops sharply as acid is added. So looking at our tip tray shin curve, the point where the ph drops sharply is here. Okay, and that gives us a Volume of about ml of acid added. So the first part of the question asks how much acid was added for the equivalence point to be reached. So here we can say that about 11 ml of acid was added to reach this equivalence point. Alright, the second part of our question asks, what is the ph at this point? So if we take a look the volume. So we know the volume is about 11 mL. The ph at the equivalence point is the midpoint of the sharp drop at about 11 mL. Okay, so looking at this whole curve, the midpoint in this curve is here and that shows us a ph of six. So r p h is equal to six. Alright, so that is the two parts to this question. We have about 11 mL of acid added for the equivalence point to be reached. And our ph at this equivalence point is six. That is the answer to this problem. I hope this was helpful.