Which of the following solutions represents a good buffer system?
A) a solution that is 0.10 mol L-1 CH3COOH and 0.10 mol L-1 CH3COOLi
B) a solution that is 0.10 mol L-1 HF and 0.10 mol L-1 CH3COONa
C) a solution that is 0.10 mol L-1 HCl and 0.10 mol L-1 NH4+
D) a solution that is 0.10 mol L-1 NaOH and 0.10 mol L-1 KOH
E) a solution that is 0.10 mol L-1 HCl and 0.10 mol L-1 KCl
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