Cobalt(II) carbonate

Cobalt(II) carbonate
IUPAC name

Cobalt(II) carbonate
Other names

Cobaltous carbonate; cobalt(II) salt
Identifiers
CAS number 12602-23-2 (cobalt carbonate hydroxide) 513-79-1, 12602-23-2 (cobalt carbonate hydroxide)
Properties[1]
Molecular formula CoCO3
Molar mass 118.94
Appearance pink, violet, red crystalline powder
Density 4.13 g/cm3
Melting point

decomposes before melting to cobalt(II) oxide
Solubility in water negligible
Structure
Crystal structure Trigonal
Hazards
R-phrases R49, R60, R42/43, R68, R50/53
S-phrases S53, S45, S60, S61
NFPA 704
0
1
0
LD50 640 mg/kg in rats
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Cobalt(II) carbonate is the inorganic compound with the formula CoCO3. This reddish paramagnetic solid is an intermediate in the hydrometallurgical purification of cobalt from its ores, as an inorganic pigment, and as a precursor to catalysts.[2] Commercially available pale violet basic cobalt carbonate, of formula with the formulaCoCO3(Co(OH)x(H2O)y (CAS 12069-68-0). Cobalt(II) carbonate occurs as the mineral spherocobaltite, which occurs as pink/red trigonal crystals with a specific gravity of 4.13g/cm3[3]

Contents

Properties

Heating the carbonate, i.e. calcining, proceeds in the usual way:

CoCO3 → CoO + CO2

The resulting CoO converts reversibly to Cobalt(II,III) oxide|Co3O4]] at high temperatures.[4]. It is an precursor to blue pottery glazes, famously in the case of Delftware.

Like most transition metal carbonates, cobalt carbonate is insoluble in water but is readily attacked by mineral acids:

CoCO3 + 2 HCl + 5 H2O → [Co(H2O)
6]Cl2 + CO2

Safety

The compound is harmful if swallowed, and irritating to eyes and skin.[1]

References

  1. ^ a b Safety data for cobalt (II) carbonate hydrate msds.chem.ox.ac.uk
  2. ^ John Dallas Donaldson, Detmar Beyersmann, "Cobalt and Cobalt Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005. doi:10.1002/14356007.a07_281.pub2
  3. ^ Spherocobaltite www.mindat.org
  4. ^ G.A. El-Shobaky, A.S. Ahmad, A.N. Al-Noaimi and H.G. El-Shobaky Journal of Thermal Analysis and Calorimetry 1996, Volume 46, Number 6 , pp.1801-1808. online abstract

See also

H2CO3 He
Li2CO3 BeCO3 B C N O F Ne
Na2CO3 MgCO3 Al2(CO3)3 Si P S Cl Ar
K2CO3 CaCO3 Sc Ti V Cr MnCO3 FeCO3 CoCO3 NiCO3 CuCO3 ZnCO3 Ga Ge As Se Br Kr
Rb2CO3 SrCO3 Y Zr Nb Mo Tc Ru Rh Pd Ag2CO3 CdCO3 In Sn Sb Te I Xe
Cs2CO3 BaCO3 Hf Ta W Re Os Ir Pt Au Hg Tl2CO3 PbCO3 Bi Po At Rn
Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Uut Uuq Uup Uuh Uus Uuo
↓
La2(CO3)3 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr