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Buffer Solutions

Aqueous solut...

Question

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

A

H N O_{3}

and

C H_{3} C O O H

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B

K O H

and

C H_{3} C O O N a

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C

H N O_{3}

and

C H_{3} C O O N a

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D

C H_{3} C O O H

and

C H_{3} C O O N a

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Solution

The correct options are
C $H N O_{3}$ and $C H_{3} C O O N a$
D $C H_{3} C O O H$ and $C H_{3} C O O N a$
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 $N H_{4} O H$ and $N H_{4} C l .$

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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