AIPMT PRELIMS2010Chemistry-Equilibrium
AIPMT PRELIMS 2010 Chemistry Buffer Solutions MCQ Question
Type: MCQ-numerical-Medium-Class 11
What is [H⁺] in mol/L of a solution that is 0.20 M in CH₃COONa and 0.10 M in CH₃COOH? Ka for CH₃COOH = 1.8 × 10⁻⁵.
A
9.0 × 10⁻⁶
B
3.5 × 10⁻⁴
C
1.1 × 10⁻⁵
D
1.8 × 10⁻⁵
Correct Answer
Option A
Detailed Explanation
Using the formula for buffer solutions, [H⁺] = Ka × ([CH₃COOH]/[CH₃COO⁻]) = 9.0 × 10⁻⁶.
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