Refer to Example 5-10. Suppose that the KMnO₄(aq) were standardized by reaction with As₂O₃ instead of iron wire. If a 0.1304 g sample that is 99.96% As₂O₃ by mass had been used in the titration, how many milliliters of the KMnO₄(aq) would have been required?

As₂O₃ + MnO₄^- + H⁺ + H₂O → H₃AsO₄ + Mn²⁺     (not balanced)

Example 5-10

A piece of iron wire weighing 0.1568 g is converted to Fe²⁺(aq) and requires 26.24 mL of a KMnO₄(aq) solution for its titration. What is the molarity of the KMnO₄(aq)?

5 Fe²⁺(aq) + MnO₄^-(aq) + 8 H⁺(aq) → 5 Fe³⁺(aq) + Mn²⁺(aq) + 4 H₂O(l)