Manganese oxalate

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Manganese oxalate
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
)
ChemSpider
ECHA InfoCard
 100.010.335 Edit this at Wikidata
EC Number
  • 211-367-3
UNII
  • InChI=1S/C2H2O4.Mn/c3-1(4)2(5)6;/h(H,3,4)(H,5,6);/q;+2/p-2
    Key: RGVLTEMOWXGQOS-UHFFFAOYSA-L
SMILES
  • C(=O)(C(=O)[O-])[O-].[Mn+2]
Properties
C2MnO4
Molar mass 142.956 g·mol−1
Appearance Light pink crystals
Density 2.43
insoluble
1.7×10−7[2]
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H302, H312
P264, P270, P280, P301+P312, P302+P352, P312, P322, P330, P363, P501
Related compounds
Related compounds
Praseodymium oxalate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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]

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.

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

See also

References

  1. ^
    doi:10.1016/S0022-4596(03)00035-5
    .
  2. ISBN 978-1138561632
    .
  3. ^ Lunge, Georg (1924). Lunge and Keane's Technical Methods of Chemical Analysis. 2d Ed., Edited by Charles A. Keane ...and P.C.L. Thorne. Gurney and Jackson. p. 61. Retrieved 5 August 2021.
  4. ^ Young, Philena Anne (1928). The Volumetric Determination of Vanadium and Chromium in Special Alloy Steels: Ceric Sulfate as a Volumetric Oxidizing Agent. Mack Printing Company. p. 74. Retrieved 5 August 2021.
  5. ISSN 0040-6031
    . Retrieved 5 August 2021.
  6. S2CID 100604132
    . Retrieved 1 December 2021.
  7. S2CID 104343447
    .
  8. ISSN 0022-4596
    .
  9. S2CID 97032400
    .
  10. ISSN 1364-5501
    .
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