試題詳解

74. Which is the major specie for a carbonate-containing solution at pH 8.5? (K_a1 = 4.3 × 10^–7 , K_a2 = 4.8 × 10^–11 for carbonic acid)
(A) CO₂
(B) H₂CO₃
(C) HCO₃⁻
(D) CO₃²⁻
(E) C₂O₄²⁻