We’re being asked which of the given solutions will have the greatest buffering capacity.
The maximum buffering capacity of a solution is when the pH of the solution is equal to pKa and the buffer range of a solution is pH = pKa ± 1.
• maximum buffering capacity: pH = pKa
• buffering range: pH = pKa ± 1
Recall the Henderson-Hasselbalch equation:
• the ideal buffer is when the amount of conjugate base is equal to the amount of the weak acid.
[conjugate base] = [weak acid]
Which of the following buffer systems would be the best choice to create a buffer with pH = 9.05?
a. HF / KF
b. HNO2 / KNO2
c. NH3 / NH4Cl
d. HClO / KClO
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