Attached is an image of the question. It is a question from a British A-Level paper, (High school equivalent). I have tried the question twice, and seeked help from a friend who studies chemistry, I am still unsure.

I am not sure if in part a, the equivalence point will still be when 1 mol of base is added. We are not given the volume of acid used. I am also unsure of whether the 'halfway' point of the titration would have the same pH. In part b, I am happy with the calculations needed, but again I am not sure if the graph would show the equivalence point when 1 mol of base is added.

The question refers to some data in "Table 12.1" The relevant data is that the pH of a 0.0001M solution of Ethanoic Acid is 4.2

Edit: Sorry the image is repeated twice, it is the same image.

Any help would be greatly appreciated.