14. Calculate the [H⁺] in a 0.010 M solution of HCN, K_a = 6.2 x 10^-10.
(A) 1.0 x 10^-7 M
(B) 2.5 x 10^-6 M
(C) 3.6 x 10^-3 M
(D) 6.2 x 10^-10 M
(E) 2.5 x 10^-5 M

考試觀念本題測驗弱酸的解離平衡計算，需...