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Question

Aqueous solutions of HNO3,KOH,CH3COOH, and CH3COONa of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is/ are:

A
HNO3 and CH3COOH
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B
KOH and CH3COONa
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C
HNO3 and CH3COONa
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D
CH3COOH and CH3COONa
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Solution

The correct options are
C HNO3 and CH3COONa
D CH3COOH and CH3COONa
A solution that resists change in pH value upon addition of small amount of strong acid or base (less than 1 %) or when a solution is diluted is called buffer solution.

Basic buffer solution: A basic buffer solution consists of a mixture of a weak base and its salt with a strong acid. The best-known example is a mixture of NH4OH and NH4Cl.

Acidic buffer solution: An acidic buffer solution consists of a solution of a weak acid and its salt with a strong base. The best-known example is a mixture of a solution of acetic acid and its salt with a strong base.

So, options C and D are buffer solutions.

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