Given the following acid dissociation constants, which acid has the strongest conjugate base?
a. HCN Ka = 6.2 x 10-10
b. HOCl Ka = 3.0 x 10-8
c. HIO3 Ka = 0.17

I believe the answer is HCN it has the lowest Ka and is the weakest acid.

asked by Christine
  1. Kb = Kw/Ka = ?
    Larger Kb means stronger base. I put in this extra step so as not to confuse Ka and Kb.
    The weakest acid should be the strongest base.

    posted by DrBob222
  2. HCN Kb = 1.0 x 10^-14/6.2 x 10^-10 = 1.61 x 10^-5
    HOCl Kb = 1.0 x 10^-14/3.0 x 0^-8 = 3.3 x 10^-7
    HIO3 Kb = 1.0 x 10^-14/.17 = 5.88 x 10^-14

    The strongest Kb appears to be HCN. Is this correct?

    posted by Christine
  3. Are you doing AP Chem? I can help

    posted by Jameson

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