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 concentration of acid decreases throughout titration
B
The second ionization is stronger than the first
C
The difference between pKa₂ and pKa₃ is smaller than between pKa₁ and pKa₂
D
The ionic strength increases as titration proceeds