Solutions of KMnO4 are used in redox titrations because dark purple MnO4 _ oxidizing
Chapter 23, Problem 23.44(choose chapter or problem)
Solutions of KMnO4 are used in redox titrations because dark purple MnO4 _ oxidizing agent changes to the faint pink Mn2_ as it is reduced. The end point occurs when a slight purple remains as more KMnO4 is added. If a sample that has reached this end point stands for a long time, the purple fades and a suspension of a small amount of brown, muddy MnO2 appears. Use standard electrode potentials to explain this result. (Sample 23.3 and 23.4)
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