Titations: Diprotic Acids TBR Question

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justadream

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TBR GC page 333 #75

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

The answer is C. TBR explains that in this situation, you can just use the formula pI = average of pKa1 and pKa2. But can someone explain more intuitively/conceptually why statement C is true?
 
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