An approximate equation for the ionization of a weak acid, including consideration of the hydrogen ions from
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An approximate equation for the ionization of a weak acid, including consideration of the hydrogen ions from water is
[H+]/c◦ =√Kac/c◦ + Kw,
where c is the gross acid concentration. This equation is based on the assumption that the concentration of unionized acid is approximately equal to the gross acid concentration. Consider a solution of HCN (hydrocyanic acid) with stoichiometric acid concentration equal to 1.00 × 10−5 mol l−1. Ka = 4 × 10−10 for HCN. At this temperature, Kw = 1.00 × 10−14.
(a) Calculate [H+]/c◦ using this equation.
(b) Calculate [H+]/c◦ using Eq. (5.9).
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