Problem: Which of the following buffer systems would be the best choice to create a buffer with pH = 9.05? a. HF / KFb. HNO2 / KNO2c. NH3 / NH4Cld. HClO / KClO

FREE Expert Solution
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FREE Expert Solution

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:

pH=pKa+logconjugate baseweak acid

the ideal buffer is when the amount of conjugate base is equal to the amount of the weak acid.

[conjugate base] = [weak acid]

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Problem Details

Which of the following buffer systems would be the best choice to create a buffer with pH = 9.05? 

a. HF / KF

b. HNO/ KNO2

c. NH3 / NH4Cl

d. HClO / KClO

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