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Solution: Of the following solutions, which has the greatest buffering capacity?a. 0.100 M NH3 and 0.455 M NH4CIb. 0.087 M NH3 and 0.088 M NH4CIc. They are all buffer solutions and would all have the same capacity.d. 0.234 M NH3 and 0.100 M NH4CIe. 0.543 M NH3 and 0.555 M NH4CI

Problem

Of the following solutions, which has the greatest buffering capacity?

a. 0.100 M NH3 and 0.455 M NH4CI

b. 0.087 M NH3 and 0.088 M NH4CI

c. They are all buffer solutions and would all have the same capacity.

d. 0.234 M NH3 and 0.100 M NH4CI

e. 0.543 M NH3 and 0.555 M NH4CI

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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