Which of these is a weak acid?

Answer and explanation

Correct answer: C. Ethanoic acid

Ethanoic acid ionises only slightly in water, so it is a weak acid.
Answer: Ethanoic acid.
Why not the others: Hydrochloric acid: it ionises completely. Nitric acid: it ionises completely. Sulfuric acid: it ionises completely.

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Which of these is a weak acid? | HKDSE (Hong Kong)