Which of the following acts as a buffer solut | vedclass

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(C) buffer solution is formed by a weak acid and its conjugate base or a weak base and its conjugate acid. In option $C$,we have $40 \, mL$ of $0.1 \,

Vedclass · Accepted Answer

$40 \, mL \, of \, 0.1 \, M \, NaCN + 20 \, mL \, of \, 0.1 \, M \, HCl$

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(C) buffer solution is formed by a weak acid and its conjugate base or a weak base and its conjugate acid. In option $C$,we have $40 \, mL$ of $0.1 \, M \, NaCN$ $(4 \, mmol)$ and $20 \, mL$ of $0.1 \, M \, HCl$ $(2 \, mmol)$. The reaction is: $NaCN + HCl \rightarrow HCN + NaCl$. After the reaction,$2 \, mmol$ of $NaCN$ (weak base) remains and $2 \, mmol$ of $HCN$ (conjugate acid) is formed. Since we have a mixture of a weak acid $(HCN)$ and its salt with a strong base $(NaCN)$,it acts as an acidic buffer.

Which of the following acts as a buffer solution?

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