AIPMT PRELIMS 2012 Chemistry Buffer Solutions MCQ Question
Buffer solutions have constant acidity and alkalinity because:
they have fixed value of pH
these give unionised acid or base on reaction with added acid or alkali
acids and alkalies in these solutions are shielded from attack by other ions
they have large excess of H⁺ or OH⁻ ions
Correct Answer
Detailed Explanation
Buffer solutions resist changes in pH upon the addition of small amounts of acid or base because they contain a weak acid and its conjugate base (or vice versa), which react with the added substances.
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