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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.$0.4 \, mol \, HNO_2$ (weak aci

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$0.4 \, mol \, HNO_2$ 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.$0.4 \, mol \, HNO_2$ (weak acid) reacts with $0.2 \, mol \, NaOH$ (strong base) to produce $0.2 \, mol \, NaNO_2$ (conjugate base) and $0.2 \, mol \, HNO_2$ remains.Since the final mixture contains both the weak acid $(HNO_2)$ and its conjugate base $(NO_2^-)$,it acts as an acidic buffer.

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

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