Which pair of substances cannot form a buffered aqueous solution? A) HCN and KCN B) NH₃ and (NH₄)₂SO₄ C) HNO₃ and NaNO₃ D) HF and NaF E) HNO₂ and NaNO₂

Question

Quizplus · Accepted Answer

A buffered solution requires a weak acid and its conjugate base or a weak base and its conjugate acid. HNO3 (nitric acid) and NaNO3 (sodium nitrate) in choice C are a strong acid and its salt, which cannot form a buffer as strong acids fully dissociate in water, leaving no weak acid to help maintain the pH.

Which Pair of Substances Cannot Form a Buffered Aqueous Solution