MHTCET 15 May 2024 Shift 2 Paper

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Question : 62 of 150

Marks: +1, -0

Acidic buffer solution is prepared by mixing proportionate quantity of

strong acid and its salt with weak base.
strong base and its salt with weak acid.
weak acid and its salt with strong base.
weak base and its salt with strong acid.
An acidic buffer solution is prepared by mixing a weak acid and its salt with a strong base. Thus, the correct choice is:
Option C: weak acid and its salt with strong base.
Buffers consist of a mixture of a weak acid and its conjugate base (often in the form of its salt) or a weak base and its conjugate acid (typically in its salt form). In the case of an acidic buffer, the weak acid will partially ionize in the solution, and the salt of the weak acid (which completely dissociates) will provide additional conjugate base. This combination helps to maintain the pH of the solution on the acidic side, resisting changes in pH upon the addition of small amounts of strong acids or bases.
For example, a common acidic buffer is composed of acetic acid $\left(\mathrm{CH}_{3} \mathrm{COOH}\right)$ and sodium acetate ( $\mathrm{CH}_{3} \mathrm{COONa}$ ). The equilibrium can be represented by:
$\mathrm{CH}_{3} \mathrm{COOH} \rightleftharpoons \mathrm{CH}_{3} \mathrm{COO}^{-}+\mathrm{H}^{+}$
The addition of acetate ions from sodium acetate will shift the equilibrium position to the left according to Le Chatelier's principle, ensuring that the pH of the solution remains relatively constant.

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