Which of the weak acids below would create a buffer with a pH closest to 3.5 when mixed with an equimolar portion of a salt that contains the conjugate base of the acid?
A) Acid 2: Ka = 5.5 x 10−1
B) Acid 3: Ka = 3.5 x 10−6
C) Acid 1: Ka = 2.5 x 10−4
D) Acid 4: Ka = 1.0 x 10−2