A) \[C{{H}_{3}}COOH+NaOH(2:1)\]
B) \[HCl+N{{H}_{3}}(aq)(1:2)\]
C) \[C{{H}_{3}}COOH+NaOH(1:2)\]
D) \[HCl+N{{H}_{3}}(2:3)\]
Correct Answer: C
Solution :
A mixture of weak acid (or weak base) and its salt with strong base (or strong acid) is known as buffer solution. The mixture of \[C{{H}_{3}}COOH+NaOH(1:2)\]is not a buffer solution because the quantity of CH3COOH is less than \[NaOH.\]Therefore, complete \[C{{H}_{3}}COOH\]reacts with \[NaOH\]\[NaOH\] to form\[C{{H}_{3}}COONa.\] \[\underset{\text{1}\,\text{mol}}{\mathop{C{{H}_{3}}COOH}}\,+\underset{\text{1}\,\text{mol}}{\mathop{NaOH}}\,\xrightarrow{{}}\underset{\text{1}\,\text{mol}}{\mathop{C{{H}_{3}}COONa}}\,+{{H}_{2}}O\]Hence, only CH3COONa (salt of strong base and NaOH (strong base) are left in the solution. Their mixture is not a buffer solution.
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