You are seeking to identify an unknown monoprotic acid by determining its Ka. A 6.05 x 10-2 M solution of this unknown monoprotic acid has a pH of 2.122. Determine the K a of this unknown acid?
A. 4.47 x 10-4
B. 9.42 x 10-4
C. 2.85 x 10-2
D. 1.08 x 10-3
E. 3.58 x 10-1
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