Aqueous solutions of $H N O_{3}, C H_{3} C O O H$ and $C H_{3} C O O K$ of identical concentrations are given. The pair(s) of the solution which may form a buffer upon mixing is(are):

N a O H

and

C H_{3} C O O H

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H N O_{3}

and

C H_{3} C O O K

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C H_{3} C O O H

and

C H_{3} C O O K

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H N O_{3} + C H_{3} C O O H

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Solution

The correct options are
A $N a O H$ and $C H_{3} C O O H$
C $H N O_{3}$ and $C H_{3} C O O K$
D $C H_{3} C O O H$ and $C H_{3} C O O K$
An acidic buffer solution contains a weak acid and its salt with strong base.
The following pairs will form buffer solutions.
(A) $N a O H$ and $C H_{3} C O O H$ react to form $C H_{3} C O O N a$ .
$N a O H + C H_{3} C O O H \to C H_{3} C O O N a + H_{2} O$
A mixture $C H_{3} C O O H + C H_{3} C O O N a$ is a buffer solution.
(B) $H N O_{3}$ and $C H_{3} C O O K$ react to form $C H_{3} C O O H$ .
$H N O_{3} + C H_{3} C O O K \to C H_{3} C O O H + K N O_{3}$
A mixture $C H_{3} C O O H + C H_{3} C O O N a$ is a buffer solution.
(C) $C H_{3} C O O H$ and $C H_{3} C O O K$ is a buffer solution.

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