A 0.00202 M solution of weak acid, HA, has a pH of 4.36. What is the value of K a for this acid?
A. 9.43 x 10-7
B. 1.05 x 10-6
C. 2.21 x 10-2
D. 9.64 x 10-7
E. 2.16 x 10-2
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