66. The concentration of Mn2(aq) can be determined by titration with MnO4 (aq) in basic solution. A 50.00 mL sample of Mn2 (aq) requires 78.42 mL of 0.04997 M KMnO4 for its titration. What is [Mn2 ] in the sample? Mn2 MnO4 MnO2(s) (not balanced)

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