Which mixture forms a buffer when dissolved i | vedclass

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(C) buffer solution is formed by a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid.In option $C$,$0.4 \, mol \, HN

Vedclass · Accepted Answer

$0.4 \, mol \, HNO_2$ and $0.2 \, mol \, NaOH$

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(C) buffer solution is formed by a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid.In option $C$,$0.4 \, mol \, HNO_2$ (weak acid) reacts with $0.2 \, mol \, NaOH$ (strong base).The reaction is: $HNO_2 + NaOH \rightarrow NaNO_2 + H_2O$.After the reaction,$0.2 \, mol$ of $HNO_2$ remains and $0.2 \, mol$ of $NaNO_2$ (conjugate base) is formed.Since the mixture contains both a weak acid $(HNO_2)$ and its conjugate base $(NO_2^-)$,it acts as a buffer solution.

Which mixture forms a buffer when dissolved in $1 \, L$ of water?

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