A Sample Containing Fe₂O₃ Is Dissolved and the Fe³⁺ Is

question 44

Multiple Choice

A sample containing Fe₂O₃ is dissolved and the Fe³⁺ is reduced to Fe²⁺, which is titrated with standard 0.0200 M KMnO₄. The skeleton equation is:
Fe²⁺ + MnO₄ ^- →Fe³⁺ + Mn²⁺ How many grams of iron (molar mass = 55.85 g/mol) are in the sample, if 25.0 mL of KMnO₄ are required in the titration?

• A) 0.140 g
• B) 0.0279 g
• C) 5.58×10 ^{- 3} g
• D) 140 g
• E) need more information

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