學士後西醫物理及化學題庫下載題庫

4. At 25 ℃, what is the approximate pH of a 0.5 M ammonium nitrite(NH₄NO₂) solution? (K_a = 5.6 x 10^-10 for NH₄⁺, 4.0 x 10^-4 for HNO₂; log2 = 0.301, log7 = 0.845)
(A) 4.70
(B)5.40
(C)6.30
(D)7.50
(E) 8.60