The Ion MnO₄^- Is Often Used to Analyze for the Fe²⁺

question 81

Multiple Choice

The ion MnO₄^- is often used to analyze for the Fe²⁺ content of an aqueous solution by using the reaction MnO₄^- + Fe²⁺  Fe³⁺ + Mn²⁺
In acidic solution. A 54.4-mL sample of a solution containing Fe²⁺ requires 33.3 mL of a 0.022 M KMnO₄ solution for complete reaction. What is the concentration of the Fe²⁺ in the original solution?

• A) 6.7  10^-2 M
• B) 1.3  10^-2 M
• C) 3.6  10^-1 M
• D) 4.0  10^-2 M
• E) 2.7  10^-3 M

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