Question

尼

選修化部分 ，第二題為何答案是C?

interactions
2. The sodium salt, NaA, of a weak acid is dissolved in water; no other substance is added. Which of
these statements (to a close approximation) is true?
(A) [H] [A] (B) [A] = [OH] (C) [HA] = [OH] (D) [H] = [OH] (E) none of these
3. Calculate the pH of 0.10 M NH4CN. (Kb for NH3 = 1.8 x 10; K₂ for HCN = 6.2 x 10-¹0)