A buffer is most effective when
- Acheck_circle
[HA] ≈ [A] and pH ≈ pK
- B
Only acid is present
- C
pH = 7
- D
[HA] >> [A]
Explanation
Maximum buffer capacity at pH = pK where the buffer can absorb roughly equal amounts of added acid or base.
Buffer Capacity
AP Chemistry· difficulty 4/5
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