A) \[HCl\]and \[NaOH\]
B) \[KOH\]and \[C{{H}_{3}}COOH\]
C) \[C{{H}_{3}}COOH\]and \[NaCl\]
D) \[C{{H}_{3}}COOH\]and \[C{{H}_{3}}COONa\]
Correct Answer: D
Solution :
Key Idea: Buffer is a mixture of weak acid with its salt with strong base or mixture of weak base and its salt with strong acid: [a]\[\text{HCl}\,\text{+}\,\text{NaOH}\] is not buffer because both are strong acid and strong base. [b] \[\text{KOH}\,\text{+}\,\text{C}{{\text{H}}_{3}}COOH\]is not buffer because they do not have common ion. [c] \[\text{C}{{\text{H}}_{\text{3}}}\text{COOH}\,\text{+}\,\text{NaCl}\]is not buffer because they do not have common ion. [d]\[\text{C}{{\text{H}}_{\text{3}}}\text{COOH}\,\text{+}\,\,\text{C}{{\text{H}}_{\text{3}}}\text{COONa}\] are buffer because \[\text{C}{{\text{H}}_{\text{3}}}\text{COOH}\]is weak acid and \[\text{C}{{\text{H}}_{\text{3}}}\text{COONa}\]its salt with strong base\[\text{(NaOH)}\text{.}\]
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