Q11 / 84 · JEE Advanced 2010 (Paper 1) · Chemistry

Aqueous solutions of $\mathrm{HNO}_3, \mathrm{KOH}$, $\mathrm{CH}_3 \mathrm{COOH}$, and $\mathrm{CH}_3 \mathrm{COONa}$ of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

  • A
    $\mathrm{HNO}_3$ and $\mathrm{CH}_3 \mathrm{COOH}$
  • B
    $\mathrm{KOH}$ and $\mathrm{CH}_3 \mathrm{COONa}$
  • Correct answer
    C
    $\mathrm{HNO}_3$ and $\mathrm{CH}_3 \mathrm{COONa}$
  • Correct answer
    D
    $\mathrm{CH}_3 \mathrm{COOH}$ and $\mathrm{CH}_3 \mathrm{COONa}$

Solution

$\mathrm{HNO}_3$ and $\mathrm{CH}_3 \mathrm{COONa}$ can form buffer if the amount of $\mathrm{HNO}_3$ is limited. However concentrations are same but the amount can differ with manipulation of volume. Ionic equilibrium Conceptual II

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

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