TBR Gchem passage XI buffers question 75

[MDhopeful74]

Question 75: For which of these titrations is the pH at equivalence the same, regardless of concentration?

A- the titration of a weak acid by a weak base
B- The titration of a strong acid by a weak base
C-The titration of the first proton of a weak diprotic acid by a strong base
D-The titration of the second proton of a weak diprotic acid by a strong base



TBR says that the answer is C because the pKa values are not affected by concentration. But aren't the pKa values for the second proton unaffected by concentration as well? Can someone explain why D cannot be the answer?

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[MDhopeful74]

Bump