You are asked to go into the lab and prepare a buffer solution with a pH of 6.40 ± 0.2. Which weak acid would be the best choice?
A) carbonic acid Ka = 4.2 x 10-7
B) phenol Ka = 1.3 x 10-10
C) ascorbic acid Ka = 8.0 x 10-5
D) hydrosulfuric acid Ka = 9.5 x 10-8
E) potassium hydrogen phthalate Ka = 3.1 x 10-6
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