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 \[C{{H}_{3}}COOH\]is less than\[NaOH\]. Therefore, total\[C{{H}_{3}}COOH\]reacts with\[NaOH\]to form\[C{{H}_{3}}COONa\]. \[\underset{1\,mol}{\mathop{C{{H}_{3}}COOH}}\,+\underset{1\,mol}{\mathop{NaOH}}\,\xrightarrow[{}]{{}}\underset{1\,mol}{\mathop{C{{H}_{3}}COONa}}\,+{{H}_{2}}O\] Hence, only\[C{{H}_{3}}COONa\](salt of strong base) and\[NaOH\](strong base) are left in the solution. Their mixture is not a buffer solution.
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