We’re being asked to determine which of the given solutions is a good buffer system.
Recall that a buffer can be composed of the following:
• weak base and its conjugate acid
• weak acid and its conjugate base
• weak acid and a strong base
▪ concentration of weak acid > concentration of strong base
• weak base and a strong acid
▪ concentration of weak base > concentration of strong acid
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
Which of the following solutions is a good buffer system?
a. A solution that is 0.10 M HC2H3O2 and 0.10 M LiC2H3O2
b. A solution that is 0.10 M HF and 0.10 M NaC 2H3O2
c. A solution that is 0.10 M NaOH and 0.10 M KOH
d. A solution that is 0.10 M HCl and 0.10 M NH 4+
e. None of the above are buffer systems
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