Worksheet: Ka to Kb Conversions

In this worksheet, we will practice converting between the dissociation constants of conjugate acid–base pairs via the autoionization constant of water.

Q1:

At 2 5 C , the value of 𝐾 b for the nitrite ion ( N O ) 2 is 2 . 1 7 × 1 0 1 1 and the self-ionization constant of water is 1 . 0 0 × 1 0 1 4 . Calculate the value of 𝐾 a for the conjugate acid of the nitrite ion.

  • A 2 . 1 7 × 1 0 3
  • B 2 . 1 7 × 1 0 1 1
  • C 3 . 9 9 × 1 0 5
  • D 4 . 6 1 × 1 0 4
  • E 1 . 6 3 × 1 0 7

Q2:

What is the ionization constant of the weak acid C H N H 3 + 3 , the conjugate acid of the base C H N H 3 2 ? The 𝐾 b of C H N H 3 3 is 4 . 4 × 1 0 4 .

  • A 2 . 3 × 1 0 3
  • B 4 . 4 × 1 0 4
  • C 2 . 3 × 1 0 4
  • D 2 . 3 × 1 0 1 1
  • E 3 . 0 × 1 0 7

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