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Acid-Base Titrations

AP Chemistry· difficulty 4/5

From the diprotic titration, the half-equivalence pH for the first dissociation is 2.5; for the second dissociation is 6.4.

First half-eq: pH=2.5 Second half-eq: pH=6.4 Find pKa1 and pKa2

What are pKa1 and pKa2?

  • A

    pKa1 = pKa2 = 4.45

  • B

    pKa1 = 5.0; pKa2 = 12.8

  • C

    pKa1 = 2.5; pKa2 = 6.4

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  • D

    pKa1 = 6.4; pKa2 = 2.5

Explanation

At each half-equivalence, pH = pKa. So pKa1 = 2.5 and pKa2 = 6.4.

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