試題詳解

68. Arrange following 0.10 M solutions from lowest to highest pH: NaF, NaC₂H₃O₂, C₅H₅NHCl, KOH, HCN. (K_a for HCN is 6.2 × 10^-10; K_a for HF is 7.2 × 10^-4; K_a for HC₂H₃O₂ is 1.8 × 10^-5; K_b for C₅H₅N is 1.7 × 10^-9)
(A) HCN, C₅H₅NHCl, NaF, NaC₂H₃O₂, KOH
(B) C₅H₅NHCl, HCN, NaF, NaC₂H₃O₂, KOH
(C) NaF, NaC₂H₃O₂, HCN, C₅H₅NHCl, KOH
(D) KOH, NaC₂H₃O₂, NaF, HCN, C₅H₅NHCl
(E) None of these