47. 57. What is the pH of an acetic acid solution where the concentration of acetic acid is 2 mM and the concentration of sodium acetate is 20 mM. The pKa of acetic acid is 4.76.
(A)5.76
(B)10.6
(C)12.6
(D)8.8

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統計： A(0), B(0), C(1), D(0), E(0) #2789547