Acid–base Equilibria
Which statement about buffer capacity is correct?
Select the correct option:
Solution
It increases as total concentration of acid + base increases
- Buffer Capacity: A measure of the ability of a buffer to resist changes in pH upon addition of small amounts of strong acid or base.
- Concentration Dependence: A buffer with 1.0 M components has a much higher capacity than a buffer with 0.01 M components because there is more 'reserve' acid/base to react.
- Optimal pH: Buffer capacity is maximum when [Acid]=[Base] (i.e., when pH=pKa).
- Buffer Range: Usually considered effective within pH=pKa±1.
- Summary: A more concentrated buffer is 'stronger' and has a higher capacity.
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About This Question
- Subject
- chemistry
- Chapter
- equilibrium
- Topic
- acid–base equilibria
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
It increases as total concentration of acid + base increases
- Buffer Capacity: A measure of the ability of a buffer to resist changes in pH upon addition of small amounts of strong acid or base.
- Concentration Dependence: A buffer with 1.0 M components has a much higher capacity than a buffer with 0.01 M components because there is more 'reserve' acid/base to react.
- Optimal pH: Buffer capacity is maximum when [Acid]=[Base] (i.e., when pH=pKa).
- Buffer Range: Usually considered effective within pH=pKa±1.
- Summary: A more concentrated buffer is 'stronger' and has a higher capacity.
This medium difficulty chemistry question is from the chapter equilibrium, covering the topic of acid–base equilibria. It appeared in the 2025 exam.
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