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Question:

Why are containers of potassium permanganate covered with aluminum foil?

When in use in a Chemistry Lab, why are containers of potassium permanganate covered with aluminum foil?

Answer:

Let me take an (educated I hope!) guessKMnO4 strongly absorbs in the visible region (I can't think of a cmpd that has a stronger molar absorbtivity)The absorption is not a d-d transition as Mn in [MnO4]^- is formally Mn(VII) or d^0It is due to a LMCT (ligand to metal charge transfer) that is strongly allowedIt takes an electron in a lone pair on oxygen and puts it into an empty Mn d AOIt essentially reduces Mn(VII) to Mn(VI) so prolonged exposure of KMnO4 to visible light will reduce Mn probably to brown MnO2 (Mn(IV) which of course will make the KMnO4 useless as a primary standard for redox analytical chem so it is wrapped in Al foil to keep ALL visible light away from itMost light sensitive cmpds are stored in brown bottles that keep the high energy blue and UV out, but that evidently this is not sufficient for potassium permanganate.
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