22. If an acid, HA, is 10.0% dissociated in a 1.0 M solution, what is the Ka for this acid?
(A) 9.1 x 10–2
(B) 1.1 x 10–2
(C) 8.1 x 10–1
(D) 6.3 x 10–2

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統計： A(3), B(10), C(9), D(1), E(0) #347709