AIIMS2004Chemistry-Acids and Bases
AIIMS 2004 Chemistry pH Calculations MCQ Question
Type: MCQ-numerical-Hard-Class 11
What is the pH of 0.01 M glycine solution? For glycine, Kₐ₁ = 4.5 × 10⁻³ and Kₐ₂ = 1.7 × 10⁻¹⁰ at 298 K?
A
3.0
B
10.0
C
6.1
D
7.2
Correct Answer
Option C
Detailed Explanation
K = Kc × K2q = 4.5×10–3×1.7×10–10 = 7.65×10–13, [H+] = √KcC = √7.65×10–13×0.01 = √7.65×10–15 = 0.87×10–7, pH = – log 0.87 × 10–7 = 7 – 0.93 = 6.07.
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