9. Which the following aqueous solution has the lowest pH?
(A) 0.1 M lactic acid (pKa = 7.86)
(B) 0.1 M acetic acid (pKa = 4.86)
(C) 0.1 M succinic acid (pKa = 4.19)
(D) 0.1 M formic acid (pKa = 3.75)

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統計： A(0), B(0), C(0), D(1), E(0) #3077626