Q38 / 155 · WBJEE 2023 · Chemistry

Which of the following mixtures act(s) as buffer solution?

  • A
    \(\mathrm{NaOH}+\mathrm{CH}_3 \mathrm{COOH}\) (1:1 mole ratio)
  • Correct answer
    B
    \(\mathrm{NH}_4 \mathrm{OH}+\mathrm{HCl}(2: 1\) mole ratio)
  • Correct answer
    C
    \(\mathrm{CH}_3 \mathrm{COOH}+\mathrm{NaOH}(2: 1\) more ratio)
  • D
    \(\mathrm{CH}_3 \mathrm{COOH}+\mathrm{NaOH}(1: 2\) mole ratio)

Solution

Hint : (B) \(\mathrm{NH}_4 \mathrm{OH}+\mathrm{HCl}~(2: 1 \text { mole ratio}) \rightarrow \underset{\large 1 \quad:\quad 1 \atop \large \text{Buffer} \quad \text{buffer}}{\mathrm{NH}_4 \mathrm{Cl}+\mathrm{NH}_4 \mathrm{OH}}\) (C) \(\mathrm{CH}_3 \mathrm{COOH}+\mathrm{NaOH}(2: 1\) mole ratio \() \rightarrow \underset{\large 1\quad : \quad 1 \atop \large \text{Acidic buffer}}{\mathrm{CH}_3 \mathrm{COONa}+\mathrm{CH}_3 \mathrm{COOH}}\)

Hence, the correct answer is options: 'B', 'C'.

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