一道英文生化题,..35.The nucleoside adenosine exists in a protonatedform with a pKa of 3.8.The percentage of theprotonated form at pH 4.8 is closest to(A) 1(B) 9(C) 50(D) 91(E) 99

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一道英文生化题,..35.The nucleoside adenosine exists in a protonatedform with a pKa of 3.8.The percentage of theprotonated form at pH 4.8 is closest to(A) 1(B) 9(C) 50(D) 91(E) 99
一道英文生化题,..
35.The nucleoside adenosine exists in a protonated
form with a pKa of 3.8.The percentage of the
protonated form at pH 4.8 is closest to
(A) 1
(B) 9
(C) 50
(D) 91
(E) 99

一道英文生化题,..35.The nucleoside adenosine exists in a protonatedform with a pKa of 3.8.The percentage of theprotonated form at pH 4.8 is closest to(A) 1(B) 9(C) 50(D) 91(E) 99
pka=ph+lg[a/(1-a)]
4.8=3.8+lg[a/(1-a)]---------a=0.09090909090909091
a约等于0.091 即9%
选B

A