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

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