A 250 ML Aliquot of a Solution Containing Fe²⁺(aq),prepared During an an Assay

question 22

Multiple Choice

A 25.0 mL aliquot of a solution containing Fe²⁺(aq) ,prepared during an assay of a pyrite ore,was titrated to a faint purple endpoint by 32.2 mL of 0.020 M KMnO₄(aq) .What was the molarity of the Fe²⁺ solution? [The permanganate was reduced to Mn²⁺(aq) .]

• A)0.13 M
• B)0.19 M
• C)0.26 M
• D)0.31 M
• E)0.47 M