Q17 / 91 · KVPY 2018 (SB/SX) · Chemistry

A buffer solution can be prepared by mixing equal volumes of

  • Correct answer
    A
    0.2 M NH4OH and 0.1 M HCl
  • B
    0.2 M NH4OH and 0.2 M HCl
  • C
    0.2 M NaOH and 0.1 M CH3COOH
  • D
    0.1 M NH4OH and 0.2 M HCl

Solution

The solutions which resist change in pH on dilution or with the addition of small amounts of acid or alkali are called buffer solution. It is a mixture of weak base with its salt or weak acid with its salt.

Thus, buffer solution can be prepared by mixing equal volumes of 0.2 M NH4OH (weak base) and 0.1 M HCl (strong acid). It results in the formation of NH4OH (weak base) +NH4Cl (salt of weak base NH4OH ), which is a basic buffer mixture.

Hence, the correct answer is option: 'A'.

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