Which of the following buffer solutions would show the least change in pH by adding a 2.0 mL of 2 M NaOH?
A: 0.2 acetic acid and 0.2 M sodium acetate buffer system
B: 0.1 M acetic acid and 0.1 M sodium acetate buffer system
C: a solution of 2.0 M acetic acid
D: a solution of 1.0 M sodium acetate
B: 0.1 M acetic acid and 0.1 M sodium acetate buffer system
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