試題詳解

89. A sample of a washing powder that contains a mixture of Na₂CO₃ and NaHCO₃ is titrated with aqueous HCl and the following result is obtained: What is the mole ratio of CO₃^2– to HCO^3– in the washing powder?
(A) 2 mole CO₃^2– : 1 mole HCO^3–
(B) 1 mole CO₃^2– : 1 mole HCO^3–
(C) 1 mole CO₃^2– : 2 mole HCO^3–
(D) 1 mole CO₃^2– : 3 mole HCO^3–
(E) 3 mole CO₃^2– : 1 mole HCO^3–(一律送分)