A buffer solution with a pH of 4.31 is prepared with 1.0 M HC2H3O2 and ________ M NaC2H3O2. The Ka of HC2H3O2 is 1.8 × 10-5.
A) 0.37
B) 0.74
C) 4.2 × 10-6
D) 8.8 × 10-10
E) 0.18
Correct Answer:
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