David and Goliath

Correct Answer: E. 10.1

The conjugate acid of a strong base is a weak acid, however the conjugate base of a weak acid is a strong base. Therefore, the strong conjugate base (from the weak acid) will drive the pH high into the basic region. We cannot determine the exact pH, but the pH would definitely be basic. The only pH value that signals a basic solution is answer option [D]. You could also solve this question looking at the answer choices. Answer options [A], [B], and [C] are all acidic. Only answer option [E] is basic, and given that there can only be one right answer, it is likely this is the right answer since it’s the odd one out.

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