31. Choose the effective pH range of an aniline/anilinium chloride buffer. The value of the Kb for aniline is 4.3 x 10-10. 
(A)3.6"'5.6,
(B) 8.4~10.4,
(C) l.1~3.1,
(D) 5.1~7.1,
(E) 10.1~12.1

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