Permanganate ion is difficult to isolate because it can easily oxidize its aqueous solvent to form MnO2 precipitate.
Concept #2: Pairing the permanganate ion with iron (II) ion or oxalic acid can help with its standardization.
Concept #3: Depending on the pH of the solution, the permanganate ion can be reduced to different forms with varying colors.
Like other strong oxidizing agents the cerium (IV) ion must first be prepared before it can take part in a redox titration.
The dichromate ion is not as strong of an oxidizing agent as Ce4+ or MnO4–, but is more readily available and stable.
The dichromate ion is predominantly used as an oxidizing agent in organic reactions.
Triiodide ion represents the weakest of the 4 strong oxidizing agents.