Question 8.4: Which is the stronger acid? (a) Benzoic acid with a Ka of 6....
Which is the stronger acid?
(a) Benzoic acid with a K_{a} of 6.5 × 10^{-5} or hydrocyanic acid with a K_{a} of 4.9 × 10^{-10}?
(b) Boric acid with a pK_{a} o f 9.14 or carbonic acid with a pK_{a} of 6.37?
Strategy
Relative acid strength is determined by comparing the K_{a} values or the pK_{a} values. If using K_{a} values, the stronger acid has the larger K_{a}. If using pK_{a} values, the stronger acid has the smaller pK_{a}.
(a) Benzoic acid is the stronger acid; it has the larger K_{a} value.
(b) Carbonic acid is the stronger acid; it has the smaller pK_{a}.
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