問題詳情
63. A chemist needs to prepare a buffered solution using one of the following acids (and its sodium salt): HA (Ka = 1.4 × 10-3),HB (Ka = 9.8 × 10-6), HC (Ka = 8.4 × 10-5), HD (Ka = 3.5 × 10-7), HE (Ka = 1.9 × 10-8). To prepare a solution buffered atpH = 5.10, which system will work best (a buffer with the best capacity)?
(A) HA and its sodium salt
(B) HB and its sodium salt
(C) HC and its sodium salt
(D) HD and its sodium salt
(E) HE and its sodium salt
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)