Difference between revisions of "Permanganic acid"
(Created page with "'''Permanganic acid''' is an unstable, strong, oxidizing acid with a formula of HMnO<sub>4</sub> == Properties == === Physical === Anhydrous permanganic acid does not exist...") |
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Permanganic acid can be dumped in the ground, because it causes the compound to decompose, oxidizing the soil and turning into the safe, insoluble manganese dioxide. But it is better to dispose it after it is already decomposed in the lab. | Permanganic acid can be dumped in the ground, because it causes the compound to decompose, oxidizing the soil and turning into the safe, insoluble manganese dioxide. But it is better to dispose it after it is already decomposed in the lab. | ||
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[[Category:Oxidizing agents]] | [[Category:Oxidizing agents]] | ||
[[Category:Unstable materials]] | [[Category:Unstable materials]] | ||
+ | [[Category:Easily prepared chemicals]] |
Revision as of 21:37, 24 August 2015
Permanganic acid is an unstable, strong, oxidizing acid with a formula of HMnO4
Contents
Properties
Physical
Anhydrous permanganic acid does not exist. Solutions of permanganic acid (up to 20%) are purple liquids. The crystallohydrate (HMnO4*2H2O) is a purple crystalline solid that decomposes above 20 degrees Celsius.
Chemical
It is a very strong oxidizer, though milder than its anhydride, manganese heptoxide. It spontaneously decomposes, evolving oxygen and precipitating manganese dioxide, which catalyzes further decomposition of the acid.
By cooling the unstable concentrated solution of the acid near the freezing point, the crystallohydrate can be prepared. Sources vary about the nature of this compound: according to some sources, it is a hydronium salt of permanganic acid, according to others, it is a complex polymanganic acid.
Preparation
Permanganic acid can be prepared by dissolving manganese heptoxide in water, or by reacting barium permanganate with sulfuric acid.
Handling
Safety
Not much is known about the hazards of permanganic acid, but one should treat it with respect, as it is both a strong acid and a strong oxidizer.
Storage
It is impractical to store this acid because of its instability.
Disposal
Permanganic acid can be dumped in the ground, because it causes the compound to decompose, oxidizing the soil and turning into the safe, insoluble manganese dioxide. But it is better to dispose it after it is already decomposed in the lab.