18. A 0.15 M solution of a weak acid is 3.0% dissociated. The Ka of the acid is calculated to be _______ .
(A)60f51ba6454c3.jpg
(B)60f51bb38799c.jpg
(C)60f51bbc6b91d.jpg
(D)60f51bc476f3f.jpg
(E)60f51bcb767da.jpg

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統計： A(0), B(0), C(5), D(1), E(0) #2739643