試題詳解

22. The MnO₄ˉ ion is often used to analyze the Fe²⁺ concentration in an aqueous solution, based on the reaction in acidic condition as follows: (MnO4ˉ + Fe²⁺ ―→ Fe³⁺ + Mn²⁺ ) A 50.00 mL sample of a solution containing Fe²⁺ requires 40.00 mL of a 0.025 M KMnO₄ solution for complete reaction. What is the concentration of the Fe²⁺ in the original solution?
(A) 1.0 × 10^-1 M
(B) 1.8 × 10^-2 M
(C) 4.5 × 10^-3 M
(D) 1.8 × 10^-3 M
(E) 9.1 × 10^-4 M