potassium permanganate*
Condy's crystals
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7-12
1
2
3
4
5
-
PS
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5.1
DHS
CW
Hazardous Chemical
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II
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1490
7722-64-7
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Moderately toxic if ingested. The solid forms explosive mixtures with combustible materials (such as sulfur, phosphorus, ammonium salts or metal powders) or with organic compounds; the solid is also spontaneously flammable on contact with glycerine, ethylene glycol and other organic compounds; forms violently explosive manganese heptoxide on mixing with concentrated sulfuric acid. Oxygen gas is formed on heating the solid, but toxic fine particles of manganese oxides are produced simultaneously; if the reaction is carried out in a test tube, place a plug of glass wool in the end of the tube to trap particles. Do not use sulfuric acid for drying oxygen gas from decomposition of potassium permanganate, since the acid could accidentally mix with the salt and react explosively. For preparing oxygen gas, it is safer to use hydrogen peroxide and potassium permanganate, or hydrogen peroxide with manganese dioxide catalyst. If potassium permanganate is used for preparation of chlorine gas by reaction with hydrochloric acid, ensure that the solid is covered with a layer of water and that hydrochloric acid is used, NOT sulfuric acid. Acidified solutions are used as an oxidant in organic chemistry for the oxidation of aldehydes or alcohols. Neutral solutions are used to distinguish between alkanes and alkenes. Note: A solution/mixture of <25% potassium permanganate is not hazardous according to the Worksafe list of designated substances. Disposal: Waste solutions of this chemical may be disposed of down the sink (to sewer). Q-Stores
16
See oxidants,
and Appendix F.
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