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