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 25C, the value of 𝐾b for the nitrite ion (NO)2 is 2.17×10 and the self-ionization constant of water is 1.00×10. Calculate, to three significant figures, the value of 𝐾a for the conjugate acid of the nitrite ion.

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

Q2:

What is the ionization constant of the weak acid CHNH33+, which is the conjugate acid of the base CHNH32? Take the 𝐾b of CHNH33 to be 4.4×10.

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

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