- Manganese(II) carbonate
Manganese(II) carbonate Identifiers CAS number PubChem ChemSpider UNII 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 (what is: /?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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.
- MnCO3 → MnO + CO2
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.
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.
- ^ a b Arno H. Reidies "Manganese Compounds" Ullmann's Encyclopedia of Chemical Technology 2007; John Wiley
- ^ "How To Stain Concrete with Manganese"
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