A 30.0 mL sample of solution containing Fe²⁺ requires 25.0 mL of 0.0200 M KMnO₄ solution to react completely. The products of the reaction are Fe³⁺ and Mn²⁺. What is the concentration of Fe²⁺ in the original solution?

Question

Quizplus · Accepted Answer

The balanced reaction is 5Fe²⁺ + MnO₄^- + 8H⁺ → 5Fe³⁺ + Mn²⁺ + 4H₂O. Using stoichiometry, the moles of KMnO₄ are 0.0200 M × 0.0250 L = 0.0005 mol. Since 1 mol of KMnO₄ reacts with 5 mol of Fe²⁺, moles of Fe²⁺ = 5 × 0.0005 mol = 0.0025 mol. The concentration of Fe²⁺ is 0.0025 mol / 0.0300 L = 0.0833 M.

A 300 ML Sample of Solution Containing Fe2+ Requires 25

A 300 ML Sample of Solution Containing Fe²⁺ Requires 25