Manganese(II) carbonate

Manganese(II) carbonate
Manganese(II) carbonate
Identifiers
CAS number 598-62-9 YesY
PubChem 11726
ChemSpider 11233 YesY
UNII 9ZV57512ZM YesY
Jmol-3D images Image 1
Properties
Molecular formula MnCO3
Molar mass 114.9469 g/mol
Appearance brown solid
Density 3.70 g/cm3
Melting point

decomp. 200 °C

Solubility in water negligible
Solubility product, Ksp 2.24 x 10-11
Refractive index (nD) 1.597 (589nm, 20°C)
Structure
Crystal structure hexagonal-rhombohedral
Hazards
EU Index Not listed
Flash point Non-flammable
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Manganese carbonate is a compound with the chemical formula MnCO3. Manganese carbonate occurs naturally as the mineral rhodochrosite. Approximately 20,000 metric tonnes were produced in 2005.[1]

Contents

Production and uses

Treatment of aqueous solutions of manganese(II) salts with alkali metal carbonates leads to precipitation of this faintly pink solid. 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 at 200 °C to give manganese(II) oxide:

MnCO3 → MnO + CO2

This method is sometimes employed in the production of manganese dioxide for dry-cell batteries and for ferrites.[1]

Manganese carbonate is widely used as an additive to plant fertilizers to cure manganese deficient crops. It is also used in health foods, in ceramics as a glaze colorant and flux, and in concrete stains.[2]

Toxicity

Manganese is essential for aerobic life and its compounds are not highly toxic. Manganese poisoning, also known as manganism, may be caused by long-term exposure to manganese dust or fumes.

See also

References

  1. ^ a b Arno H. Reidies "Manganese Compounds" Ullmann's Encyclopedia of Chemical Technology 2007; John Wiley
  2. ^ "How To Stain Concrete with Manganese"

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