AIPMT PRELIMS2002Chemistry-Ionic Equilibrium
AIPMT PRELIMS 2002 Chemistry Buffer Solutions MCQ Question
Type: MCQ-numerical-Medium-Class 11
Solution of 0.1 N NH₄OH and 0.1 N NH₄Cl has pH 9.25, Then find out pkb of NH₄OH :-
A
9.25
B
4.75
C
3.75
D
8.25
Correct Answer
Option B
Detailed Explanation
Using the Henderson-Hasselbalch equation for a buffer solution: pH = pKa + log([base]/[acid]). Here, pH = 9.25, pKa =¹⁴⁻ pkb, so pkb = 4.75.
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