3D model (JSmol)
|UN number||3085, 1482|
|Molar mass||136.974 g/mol|
|Appearance||rhombic needle crystals or powder with rich violet-brown or dark purple metallic sheen, become steel-gray in storage;|
magenta–rose in solution
|8.0 g/100 ml at 15 °C|
Std enthalpy of
|Main hazards||Oxidant (O), Harmful (Xn), Dangerous for the environment (N)|
|Safety data sheet||[ External MSDS]|
|Sodium permanganate; Potassium permanganate|
|Potassium manganate (K2MnO4); Manganese heptoxide;|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|‹See TfM› (what is ‹See TfM› ?)|
Ammonium permanganate is the chemical compound NH4MnO4, or NH3·HMnO4. It is soluble in water. It is a strong oxidizer, owing to its permanganate anion, and it is a moderately strong explosive, owing to the combination of oxidizer permanganate anion and reducing ammonium cation. Dry ammonium permanganate can detonate by heat, shock, or friction, and it may explode at temperatures above 140 °F (60 °C).
- 2 NH4MnO4 → 2 MnO2 + N2 + 4 H2O
Ammonium permanganate was first prepared by Eilhard Mitscherlich in 1824 by reaction of silver permanganate with equal molar amount of ammonium chloride, filtering the silver chloride and evaporating the water. It can be also prepared in a similar way from barium permanganate and ammonium sulfate.
Ammonium permanganate decomposes slowly in storage even at normal temperatures. A sample stored for 3 months was only 96% pure, after 6 months it assumed color of iodine and had strong smell of nitrogen oxides. It emits toxic fumes when decomposed by heat.
- "MSDS Chemical Information File: Ammonium Permanganate". February 1988.
- Chisholm, Hugh, ed. (1911). "Manganese". Encyclopædia Britannica. 17 (11th ed.). Cambridge University Press. pp. 569–571.
- Seymour M. Kaye (1978). Encyclopedia of Explosives and Related Items. 8.
- Org Prep Daily (March 16, 2008). "Tetrabutylammonium Permanganate".
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