Manganese(II) carbonate

Last updated
Manganese(II) carbonate
Mn2+[CO32−]
Manganese (II) Carbonate.jpg
Names
IUPAC name
Manganese(II) carbonate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.009.040 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 209-942-9
PubChem CID
UNII
  • InChI=1S/CH2O3.Mn/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Yes check.svgY
    Key: XMWCXZJXESXBBY-UHFFFAOYSA-L Yes check.svgY
  • InChI=1/CH2O3.Mn/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2
    Key: XMWCXZJXESXBBY-NUQVWONBAJ
  • [Mn+2].[O-]C([O-])=O
Properties
MnCO3
Molar mass 114.95 g mol−1
AppearanceWhite to faint pink solid
Density 3.12 g/cm3
Melting point 200–300 °C (392–572 °F; 473–573 K)
decomposes [1] [2]
negligible
2.24 x 10−11
Solubility soluble in dilute acid, CO2
insoluble in alcohol, ammonia
+11,400·10−6 cm3/mol
1.597 (20 °C, 589 nm)
Structure
hexagonal-rhombohedral
Thermochemistry
94.8 J/mol·K [2]
Std molar
entropy (S⦵298)
109.5 J/mol·K [2]
-881.7 kJ/mol [2]
-811.4 kJ/mol [2]
Hazards
Flash point Non-flammable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Yes check.svgY  verify  (what is  Yes check.svgYX mark.svgN ?)

Manganese carbonate is a compound with the chemical formula Mn CO3. Manganese carbonate occurs naturally as the mineral rhodochrosite but it is typically produced industrially. It is a pale pink, water-insoluble solid. Approximately 20,000 metric tonnes were produced in 2005. [3]

Contents

Structure and production

Manganese carbonate crystallizes in the same dense motif as calcium carbonate. Color code: red = O, green = Mn. Calcium-carbonate-xtal-3D-SF.png
Manganese carbonate crystallizes in the same dense motif as calcium carbonate. Color code: red = O, green = Mn.

MnCO3 adopts a structure like calcite, consisting of manganese(II) ions in an octahedral coordination geometry. [4]

Treatment of aqueous solutions of manganese(II) nitrate with ammonia and carbon dioxide leads to precipitation of this faintly pink solid. The side product, ammonium nitrate is used as fertilizer.

Pink rhodochrosite, the mineral form of MnCO3, is of practical value as well as sought by collectors. Rhodochrosite-Pyrite-Calcite-219228.jpg
Pink rhodochrosite, the mineral form of MnCO3, is of practical value as well as sought by collectors.

Reactions and uses

The carbonate is insoluble in water but, like most carbonates, hydrolyses upon treatment with acids to give water-soluble salts.

Manganese carbonate decomposes with release of carbon dioxide, i.e. calcining, at 200 °C to give MnO1.88:

MnCO3 + 0.44 O2 → MnO1.8 + CO2

This method is sometimes employed in the production of manganese dioxide, which is used in dry-cell batteries and for ferrites. [3]

Manganese carbonate is widely used as an additive within plant fertilizers. It is also used in multivitamins, in ceramics as a glaze colorant and flux, and in concrete stains. [5]

Toxicity

Manganese poisoning, also known as manganism, may be caused by long-term exposure to manganese dust or fumes.

See also

References

  1. ↑ Sigma-Aldrich Co., Manganese(II) carbonate. Retrieved on 2014-05-06.
  2. 1 2 3 4 5 "Manganese(II) carbonate".
  3. 1 2 Arno H. Reidies (2007). "Manganese Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a16_123. ISBN   978-3527306732.
  4. ↑ Pertlik, F. (1986). "Structures of hydrothermally synthesized cobalt(II) carbonate and nickel(II) carbonate". Acta Crystallographica Section C. 42: 4–5. doi:10.1107/S0108270186097524.
  5. ↑ "How To Stain Concrete with Manganese"
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.