Difference between revisions of "Potassium hypomanganate"
Physchim62 (talk | contribs) (Created page with ''''Potassium hypomanganate''', K<sub>3</sub>MnO<sub>4</sub>, is a bright blue salt and a rare example of a manganese(V) compound. It is formed: *by the reduction of [[potassium p…') |
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| + | {{chembox | ||
| + | | IUPACName = potassium manganate(V)<br/>potassium tetraoxidomanganate(3−) | ||
| + | | Section2 = {{Chembox Properties | ||
| + | | Formula = K<sub>3</sub>MnO<sub>4</sub> | ||
| + | | MolarMass = 236.23 g mol<sup>−1</sup> | ||
| + | }} | ||
| + | | Section8 = {{Chembox Related | ||
| + | | OtherAnions = [[Potassium manganate]]<br/>[[Potassium permanganate]] | ||
| + | }} | ||
| + | }} | ||
'''Potassium hypomanganate''', K<sub>3</sub>MnO<sub>4</sub>, is a bright blue salt and a rare example of a manganese(V) compound. It is formed: | '''Potassium hypomanganate''', K<sub>3</sub>MnO<sub>4</sub>, is a bright blue salt and a rare example of a manganese(V) compound. It is formed: | ||
*by the reduction of [[potassium permanganate]] with excess [[potassium sulfite]];<ref name="C&W">{{Cotton&Wilkinson4th|page=746}}.</ref><ref name="G&E">{{Greenwood&Earnshaw1st|page=1222}}.</ref> | *by the reduction of [[potassium permanganate]] with excess [[potassium sulfite]];<ref name="C&W">{{Cotton&Wilkinson4th|page=746}}.</ref><ref name="G&E">{{Greenwood&Earnshaw1st|page=1222}}.</ref> | ||
::MnO{{su|b=4|p=−}} + SO{{su|b=3|p=2−}} + H<sub>2</sub>O → MnO{{su|b=4|p=3−}} + SO{{su|b=4|p=2−}} + {{nowrap|2 H<sup>+</sup>}} | ::MnO{{su|b=4|p=−}} + SO{{su|b=3|p=2−}} + H<sub>2</sub>O → MnO{{su|b=4|p=3−}} + SO{{su|b=4|p=2−}} + {{nowrap|2 H<sup>+</sup>}} | ||
*by [[disproportionation]] when [[manganese dioxide]] is dissolved in a concentrated solution of [[potassium hydroxide]];<ref name="C&W"/> | *by [[disproportionation]] when [[manganese dioxide]] is dissolved in a concentrated solution of [[potassium hydroxide]];<ref name="C&W"/> | ||
| − | ::{{nowrap|2 MnO<sub>2</sub>}} → MnO{{su|b=4|p=3−}} + | + | ::{{nowrap|2 MnO<sub>2</sub>}} + {{nowrap|3 OH<sup>−</sup>}} → MnO{{su|b=4|p=3−}} + MnO(OH) + H<sub>2</sub>O |
==References== | ==References== | ||
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[[Category:Potassium compounds]] | [[Category:Potassium compounds]] | ||
| + | [[Category:Salts of manganese oxoacids]] | ||
{{CC-BY-3.0}} | {{CC-BY-3.0}} | ||
Revision as of 09:01, 26 June 2010
| Potassium hypomanganate | |
|---|---|
| IUPAC name | potassium manganate(V) potassium tetraoxidomanganate(3−) |
| Properties | |
| Chemical formula | K3MnO4 |
| Molar mass | 236.23 g mol−1 |
| Related compounds | |
| Other anions | Potassium manganate Potassium permanganate |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Potassium hypomanganate, K3MnO4, is a bright blue salt and a rare example of a manganese(V) compound. It is formed:
- by the reduction of potassium permanganate with excess potassium sulfite;[1][2]
- MnO−4 + SO2−3 + H2O → MnO3−4 + SO2−4 + 2 H+
- by disproportionation when manganese dioxide is dissolved in a concentrated solution of potassium hydroxide;[1]
- 2 MnO2 + 3 OH− → MnO3−4 + MnO(OH) + H2O
References
- ↑ 1.0 1.1 Cotton, F. Albert; Wilkinson, Geoffrey Advanced Inorganic Chemistry, 4th ed.; Wiley: New York, 1980; p 746. ISBN 0-471-02775-8.
- ↑ Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; p 1222. ISBN 0-08-022057-6.
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