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Buffer Solution Combinations

Question: Which one of the following combinations cannot function as a buffer solution?

HCN and KCN
NH3 and (NH4)2SO4
HONO2 and NaNO3
HF and NaF
HONO and NaNO2

Solution This solution is FREE courtesy of BrainMass!

The correct answer is teh third from the top: HONO2 and NaNO3. HNO3 is a very strong acid, whereas to be an efcetive buffer, we need a weak acid.