Names | |
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IUPAC names
potassium manganate(V)
potassium tetraoxidomanganate(3−) | |
Identifiers | |
3D model (
JSmol)
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ChemSpider | |
PubChem
CID
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CompTox Dashboard (
EPA)
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Properties [1] | |
K3MnO4 | |
Molar mass | 236.229 g·mol−1 |
Appearance | bright blue solid |
Density | 2.78 g/cm3 |
Melting point | 900 °C (1,650 °F; 1,170 K) (decomposes) |
UV-vis (λmax) | 670 nm (ε = 900 dm3 mol−1 cm−1) |
Related compounds | |
Other
anions
|
Potassium manganate Potassium permanganate |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Potassium hypomanganate is the inorganic compound with the formula K3MnO4. Also known as potassium manganate(V), this bright blue solid is a rare example of a salt with the hypomanganate or manganate(V) anion, where the manganese atom is in the +5 oxidation state. It is an intermediate in the production of potassium permanganate and the industrially most important Mn(V) compound. [2]
Potassium hypomanganate is oxidized in water to potassium manganate: [3]
However, it undergoes disproportionation in acidic solutions producing manganese dioxide and potassium permanganate. [3]
In the absence of moisture, it is stable up to 900 °C. Above that temperature, it decomposes to potassium oxide, manganese(II,III) oxide, and oxygen. [4]
The solid salt can be produced by the reaction of potassium carbonate and manganese carbonate in the presence of oxygen at 800 °C. [3] However, in the industrial process of producing potassium permanganate, it is produced by fusing manganese dioxide and potassium hydroxide. The resulting hypomanganate further reacts with water to produce manganate. [2]
A solution of potassium hypomanganate is produced:
The compound is unstable due to the tendency of the hypomanganate anion to disproportionate in all but the most alkaline solutions. [5] [6]
Names | |
---|---|
IUPAC names
potassium manganate(V)
potassium tetraoxidomanganate(3−) | |
Identifiers | |
3D model (
JSmol)
|
|
ChemSpider | |
PubChem
CID
|
|
CompTox Dashboard (
EPA)
|
|
| |
| |
Properties [1] | |
K3MnO4 | |
Molar mass | 236.229 g·mol−1 |
Appearance | bright blue solid |
Density | 2.78 g/cm3 |
Melting point | 900 °C (1,650 °F; 1,170 K) (decomposes) |
UV-vis (λmax) | 670 nm (ε = 900 dm3 mol−1 cm−1) |
Related compounds | |
Other
anions
|
Potassium manganate Potassium permanganate |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Potassium hypomanganate is the inorganic compound with the formula K3MnO4. Also known as potassium manganate(V), this bright blue solid is a rare example of a salt with the hypomanganate or manganate(V) anion, where the manganese atom is in the +5 oxidation state. It is an intermediate in the production of potassium permanganate and the industrially most important Mn(V) compound. [2]
Potassium hypomanganate is oxidized in water to potassium manganate: [3]
However, it undergoes disproportionation in acidic solutions producing manganese dioxide and potassium permanganate. [3]
In the absence of moisture, it is stable up to 900 °C. Above that temperature, it decomposes to potassium oxide, manganese(II,III) oxide, and oxygen. [4]
The solid salt can be produced by the reaction of potassium carbonate and manganese carbonate in the presence of oxygen at 800 °C. [3] However, in the industrial process of producing potassium permanganate, it is produced by fusing manganese dioxide and potassium hydroxide. The resulting hypomanganate further reacts with water to produce manganate. [2]
A solution of potassium hypomanganate is produced:
The compound is unstable due to the tendency of the hypomanganate anion to disproportionate in all but the most alkaline solutions. [5] [6]