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Titrations: Diprotic & Polyprotic Buffers

18. Aqueous Equilibrium / Titrations: Diprotic & Polyprotic Buffers / Problem 1

The curve below shows the titration of a diprotic acid H₂A with NaOH. Estimate the pKa values for the diprotic acid.

A

pKa₁ = 2.0; pKa₂ = 5.3

B

pKa₁ = 4.2; pKa₂ = 9.4

C

pKa₁ = 2.5; pKa₂ = 6.5

D

pKa₁ = 3.5; pKa₂ = 7.0

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