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a salt of permanganic acid
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a salt of permanganic acid (HMnO4). Permanganate crystals are nearly black, with a greenish violet hue, while permanganate solutions are usually tinted the red-violet color of the Permanganate ion. Permanganates of sodium and bivalent metals dissolve freely in water, but KMnO4 is only sparingly soluble. Permanganates are extremely unstable upon heating. For example, KMnO4 decomposes at temperatures as low as 200°C according to the equation 2KMnO4 = K2MnO4 + MnO2+ O2.

Permanganates are strong oxidizing agents, especially in an acid medium; thus, for example, Mn(VII) reduces to Mn(II), as in MnSO4. Their use as oxidizing agents in chemistry is widespread, and in medicine permanganates are used as disinfectants and in the treatment of burns.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(inorganic chemistry)
A purple salt of permanganic acid containing the MnO4- radical; used as an oxidizing agent and a disinfectant.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.