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Question

Which of the following can be used as a buffer solution?

A
A solution containing NaCl and NaOH.
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B
A solution containing NaCl and NH4OH.
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C
A solution containing sodium acetate.
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D
A solution containing ammonium acetate.
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Solution

The correct option is D A solution containing ammonium acetate.

A buffer solution is a solution which resists any change in its pH value on dilution or an addition of solution of an acid or alkali. The process by which added H+ or OH ions are removed so that pH remains constant is known as buffer action.

Types of buffers

1. Simple buffers: (a) A salt of weak acid and weak base in water, e.g., CH3COONH4, NH4CN

(b) Proteins and amino acids

. (c) A mixture of an acid salt and normal salt of a polybasic acid, e.g., Na2HPO4 + Na3PO4

Ammonium acetate contains strong conjugate cation and strong conjugate anion. Hence, its solution can be used as a buffer solution.


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