NEET2013Chemistry-Physical Chemistry
NEET 2013 Chemistry Acid-Base Equilibria MCQ Question
Type: MCQ-numerical-Medium-Class 11
The dissociation constant of a weak acid is 1 × 10⁻⁵. In order to prepare a buffer solution with a pH = 5, the [salt]/[Acid] ratio should be:
A
4 : 5
B
10 : 1
C
5 : 4
D
1 : 10
Correct Answer
Option B
Detailed Explanation
Using the Henderson-Hasselbalch equation, pH = pKa + log([salt]/[acid]). For pH = 5 and pKa = 5, the ratio [salt]/[acid] should be 10:1.
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