Buffer Regions In Polyprotic Acid Titration
The titration curve for a polyprotic acid has three distinct buffer regions. Which of the following best explains why the second buffer region has a narrower pH range than the first?
A
The second ionization is stronger than the first
B
The concentration of acid decreases throughout titration
C
The ionic strength increases as titration proceeds
D
The difference between pKa₂ and pKa₃ is smaller than between pKa₁ and pKa₂
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