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Question

What among the following solutions will be the most efficient buffer?

A
0.1M CH3COONa+0.01M CH3COOH
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B
0.1M NH4Cl+0.1M NH4OH
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C
0.001M HCOOH+0.002M HCOONa
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D
All of the above
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Solution

The correct option is B 0.1M NH4Cl+0.1M NH4OH
Buffer capacity of solution is maximum under the following conditions :

[Salt] = [Acid] (in acid buffer)

[Salt] = [Base] (in base buffer)

A) [CH3COONa][CH3COOH]

B) [NH4Cl]=[NH4OH]

C) [HCOOH][HCOONa]

Now, the condition B involving equal concentrations of salt and base should be most efficient buffer.

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