Manganese oxalate
Chemical compound
From Wikipedia, the free encyclopedia
Manganese oxalate is an inorganic compound with the chemical formula MnC2O4.[3][4] Solid samples are pale pink and insoluble in water. At least two hydrates have been observed.[5] It occurs naturally as the mineral Lindbergite.[6]
Portion of manganese(II) oxalate dihydrate crystal (red = O, blue = Mn, white = H)[1] | |
| Names | |
|---|---|
| Other names
Manganese(II) oxalate, Manganese(2+) oxalate, Lindbergite | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.010.335 |
| EC Number |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C2MnO4 | |
| Molar mass | 142.956 g·mol−1 |
| Appearance | Light pink crystals |
| Density | 2.43 |
| insoluble | |
Solubility product (Ksp) |
1.7×10−7[2] |
| Hazards | |
| GHS labelling: | |
 | |
| Warning | |
| H302, H312 | |
| P264, P270, P280, P301+P312, P302+P352, P312, P322, P330, P363, P501 | |
| Related compounds | |
Related compounds |
Magnesium oxalate Strontium oxalate Barium oxalate Iron(II) oxalate Iron(III) oxalate Praseodymium oxalate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
Exchange reaction between sodium oxalate and manganese chloride:
- MnCl2 + Na2C2O4 + 2 H2O → MnC2O4·2H2O + 2 NaCl
The dihydrate can also be prepared hydrothermally.[1]
Physical properties
Manganese oxalate forms light pink crystals. The crystalline hydrates have the composition MnC2O4•n H2O, where n = 2 and 3.[7] The dihydrate forms light pink crystals of the orthorhombic system, space group P212121, cell parameters a = 0.6262 nm, b = 1.3585 nm, c = 0.6091 nm, Z = 4, melts in its own crystallization water at 100 °C.[8][9]
It does not dissolve in water, pKsp = 6.8.
Chemical properties
Manganese oxalate is a precursor various manganese oxides, such as MnO, Mn
2O
3, and Mn
3O
4. it decomposes at 215 °C:[10]
- MnC2O4 → MnO + CO2 + CO