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Worksheet: Ka to Kb Conversions

Q1:

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 Γ— 1 0 βˆ’ 4 .

  • A 2 . 3 Γ— 1 0 βˆ’ 3
  • B 4 . 4 Γ— 1 0 βˆ’ 4
  • C 2 . 3 Γ— 1 0 βˆ’ 4
  • D 2 . 3 Γ— 1 0 βˆ’ 1 1
  • E 3 . 0 Γ— 1 0 βˆ’ 7

Q2:

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

  • A 2 . 1 7 Γ— 1 0 βˆ’ 3
  • B 2 . 1 7 Γ— 1 0 βˆ’ 1 1
  • C 3 . 9 9 Γ— 1 0 βˆ’ 5
  • D 4 . 6 1 Γ— 1 0 βˆ’ 4
  • E 1 . 6 3 Γ— 1 0 βˆ’ 7