30. Formic acid (HCOOH) has a pKa of 3.744 What is the molar ratio of potassium formate (HCOOK) to formic acid at pH 3.744?
(A) 10:1
(B) 1:10
(C) 21
(D) 1:1

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統計： A(0), B(1), C(0), D(3), E(0) #2769028