Weak Acid Equilibrium
For a weak acid HA with Ka = 4 × 10⁻⁵ and concentration 0.1 M, the degree of ionization is approximately:
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About This Question
- Subject
- chemistry
- Chapter
- equilibrium
- Topic
- weak acid equilibrium
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
0.02
For a Weak Acid (HA): HA⇌H++A−
- Let C be concentration and α be the degree of ionization.
- Ka=1−αCα2. For α≪1, then Ka≈Cα2. Calculation: α=CKa=0.14×10−5=4×10−4 α=2×10−2=0.02
- This represents 2% ionization.
This medium difficulty chemistry question is from the chapter equilibrium, covering the topic of weak acid equilibrium. It appeared in the 2025 exam.
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