問題詳情
15. For a triprotic acid H3A with pK1 = 3.0, pK2 = 6.0 and pK3 = 9.0, which of the following relations is correct?
(A) [H3A] = [A3- ] at pH = 7.0
(B) [HA2- ]/[A3- ] = 10 at pH 7.0
(C) [H2A- ] ＞ [HA2- ] at pH 6.5
(D) [H3A] ＞ [HA2- ] at pH 5.0 3
參考答案
答案：B
統計：A:0,B:0,C:0,D:1,E:0
難度：計算中