試題詳解

At pH 6.4, which one of the following is true of the relative amounts of acid and conjugate base present?
(A)[H₂CO₃] ＞ [HCO₃¯] and [H₂PO₄^-] ＞ [HPO₄^2-]
(B) [HCO₃^-] ＞ [H₂CO₃] and [HPO₄^2-] ＞ [H₂PO₄^-]
(C) [H₂CO₃] ＞ [HCO₃^-] and [HPO₄^2-] ＞ [H₂PO₄^-]
(D)[H₂CO₃] = [HCO₃^-] and [HPO₄^2-] ＞ [H₂PO₄^-]
(E) [H₂CO₃] = [HCO₃^-] and [H₂PO₄^-] ＞ [HPO₄^2-]