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Inductive Effect

Which buffer ...

Question

Which buffer solution comprising of the following has its $p H$ value greater than 7?

{C H}_{3} C O O H

{C H}_{3} C O O N a

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H C O O H + H C O O K

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{C H}_{3} C O O {N H}_{4}

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{N H}_{4} O H + {N H}_{4} C l

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Solution

The correct option is D ${N H}_{4} O H + {N H}_{4} C l$
The $p H$ value of a basic buffer is always greater than $7.$
Among the given options, $N H_{4} O H + N H_{4} C l$ is the only mixture which consists of a mixture of a weak base and its conjugated salt and thus, has a $p H$ greater than 7.

Hence, option $D$ is correct.

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