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Potassium permangate used as an oxidizing agent in the synthesis of cocaine and methcathinone. This led to the Drug Enforcement Administration launching Operation Purple in 2000, with the goal of monitoring the world supply of potassium permanganate however, potassium permanganate derivatives and substitutes were soon used thereafter to avoid the operation. Potassium permanganate can be used to oxidize cocaine paste to purify it and increase its stability. Its ready conversion to brown MnO 2 creates "hundred-year-old" or "ancient" looks on hessian cloth (burlap), ropes, timber, and glass. Potassium permanganate is one of the principal chemicals used in the film and television industries to "age" props and set dressings. Both handheld and helicopter- or boat-mounted plastic sphere dispensers are used. Polymer spheres resembling ping-pong balls containing small amounts of permanganate are injected with ethylene glycol and projected towards the area where ignition is desired, where they spontaneously ignite seconds later. Potassium permanganate is added to "plastic sphere dispensers" to create backfires, burnouts, and controlled burns.

Potassium permanganate is sometimes included in survival kits: as a hypergolic fire starter (when mixed with glycerol antifreeze from a car radiator as a water sterilizer and for creating distress signals on snow). By removing ethylene by oxidation, the permanganate delays the ripening, increasing the fruit's shelf life up to 4 weeks without the need for refrigeration. This effect can be exploited by packing bananas in polyethylene together with potassium permanganate. Fruit preservation Įthylene absorbents extend storage time of bananas even at high temperatures. In histology, potassium permanganate was used as a bleaching agent. Īqueous, acidic solutions of KMnO 4 are used to collect gaseous mercury in flue gas during stationary source emissions testing. In agricultural chemistry, it is used for estimation of active carbon in soil. For the standardization of KMnO 4 solutions, reduction by oxalic acid is often used. In a related way, it is used as a reagent to determine the Kappa number of wood pulp. As potassium permanganate is titrated, the solution becomes a light shade of purple, which darkens as excess of the titrant is added to the solution. In analytical chemistry, a standardized aqueous solution of KMnO 4 is sometimes used as an oxidizing titrant for redox titrations ( permanganometry). The value determined is known as the permanganate value. Potassium permanganate can be used to quantitatively determine the total oxidizable organic material in an aqueous sample. Such compounds result in a white to orange spot on TLC plates. KMnO 4 solution is a common thin layer chromatography stain for the detection of oxidizable functional groups, such as alcohols, aldehydes, alkenes, and ketones. As a strong oxidant that does not generate toxic byproducts, KMnO 4 has many niche uses. Uses Īlmost all applications of potassium permanganate exploit its oxidizing properties. The purplish-black color of solid potassium permanganate, and the intensely pink to purple color of its solutions, is caused by its permanganate anion, which gets its color from a strong charge-transfer absorption band caused by excitation of electrons from oxo ligand orbitals to empty orbitals of the manganese(VII) center. In the solid (as in solution), each MnO − 4 centre is tetrahedral. The overall motif is similar to that for barium sulfate, with which it forms solid solutions.

KMnO 4 forms orthorhombic crystals with constants: a = 910.5 pm, b = 572.0 pm, c = 742.5 pm. Potassium permanganate is the potassium salt of the tetrahedral transition metal oxo complex permanganate, in which four O 2− ligands are bound to a manganese(VII) center. In 2000, worldwide production was estimated at 30,000 tons.

It is on the World Health Organization's List of Essential Medicines. Potassium permanganate is widely used in the chemical industry and laboratories as a strong oxidizing agent, and also as a medication for dermatitis, for cleaning wounds, and general disinfection. It is a purplish-black crystalline salt, that dissolves in water as K + and MnO − Potassium permanganate is an inorganic compound with the chemical formula KMnO 4.