Given the following K a values, which anion is the strongest base? Acid Ka
HF 7.1 x 10-4
HCOOH 1.7 x 10-4
HCN 4.9 x 10-10
HNO2 4.5 x 10-4
CH3COOH 1.8 x 10-5

CH₃COOH; Ka = 1.8x10⁻⁵

Explanation:

When there are a conjugate acid-base pair, if the acid is weak, the base is strong and vice versa.

Now, the highest pKa, the strongest acid. If we want to find the strongest base we need to find the weak acid that is the acid with the lowest pKa.

In the options, the acid with the lowest pKa is:

explanation:

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