Which of the following aqueous mixture is a buffer solution?
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- Acetic acid + Ammonium chloride
- Hydrochloric acid + Potassium acetate
- Acetic acid + Sodium chloride
- Acetic acid + Sodium acetate
- Sodium hydroxide + Potassium acetate
The Correct Option is D
Solution and Explanation
In this case, acetic acid is a weak acid and sodium acetate is the salt of the conjugate base of acetic acid (\( {CH}_3{COO}^- \)).
The mixture of acetic acid and sodium acetate forms a buffer solution because the acetic acid dissociates to produce \( {H}^+ \) and \( {CH}_3{COO}^- \), and the sodium acetate dissociates to produce \( {CH}_3{COO}^- \) and \( {Na}^+ \), thus maintaining the pH of the solution.
Therefore, the correct answer is (D) Acetic acid + Sodium acetate.
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