APFIVE Effective Buffer pH Range
Which statement best describes the relationship between the effectiveness of a buffer solution and the pH and pKa values of its components?
A
Buffer strength is maximized when the pH is exactly equal to the pKa of its conjugate base component.
B
A buffer solution is strongest when the pH is within ±1 unit of the pKa of its weak acid or base component.
C
The buffer solution’s strength increases as the difference between pH and pKa approaches 2 units.
D
The buffer solution’s efficacy is independent of the relationship between pH and pKa values.
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