Cobalt carbonate Property

Melting point:

decomposes [KIR79]

Density 

4.13 g/mL at 25 °C(lit.)

vapor pressure 

0Pa at 20℃

storage temp. 

under inert gas (nitrogen or Argon) at 2-8°C

solubility 

insoluble in ethanol

form 

Powder

color 

Pink

Specific Gravity

4.13

Water Solubility 

Insoluble in water, alcohol and methyl acetate.

Merck 

14,2436

Solubility Product Constant (Ksp)

pKsp: 12.84

Exposure limits

ACGIH: TWA 0.02 mg/m3

Stability:

Air sensitive. Incompatible with strong oxidizing agents.

InChI

InChI=1S/CH2O3.Co/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2

InChIKey

ZOTKGJBKKKVBJZ-UHFFFAOYSA-L

SMILES

C([O-])([O-])=O.[Co+2]

CAS DataBase Reference

513-79-1(CAS DataBase Reference)

EPA Substance Registry System

Cobalt(II) carbonate (513-79-1)

Safety

Hazard Codes 

Xn

Risk Statements 

22-36/37/38-40-43

Safety Statements 

26-36/37

WGK Germany 

3

TSCA 

Yes

HazardClass 

9

HS Code 

28369930

Hazardous Substances Data

513-79-1(Hazardous Substances Data)

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H302Harmful if swallowed

H317May cause an allergic skin reaction

H334May cause allergy or asthma symptoms or breathing difficulties if inhaled

H341Suspected of causing genetic defects

H350May cause cancer

H360May damage fertility or the unborn child

H400Very toxic to aquatic life

H410Very toxic to aquatic life with long lasting effects

Precautionary statements

P201Obtain special instructions before use.

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P284Wear respiratory protection.

P405Store locked up.

Cobalt carbonate Chemical Properties,Usage,Production

Physical Properties

Pink rhombohedral crystals; refractive index 1.855; density 4.13 g/cm3; decomposes on heating; insoluble in water and ethanol; soluble in acids.

Uses

The compound occurs in nature as the mineral cobalt spar or sphaerocobaltite. It is used in ceramics; in cobalt pigments; as a catalyst; as a temperature indicator; and in the preparation of other cobalt(II) salts. It also is added to soil to provide nutritional supplement in forage for cattle.

Preparation

Cobalt carbonate is prepared by heating cobaltous sulfate, cobaltous chloride or any Co2+ salt with sodium bicarbonate in solution:
CoSO4 + NaHCO3→ CoCO3 + NaHSO4

Reactions

Cobalt carbonate dissolves in concentrated HCl or HNO3 when heated, evolving CO2:
CoCO3 + HCl→CoCl2 + CO2 + H2O
It is oxidized by air or weak oxidizing agents, forming cobalt(III) carbonate, Co2(CO3)3. It decomposes on heating, forming the oxides of cobalt with the evolution of CO2.

Toxicity

The compound is moderately toxic by ingestion. (Lewis (Sr.), R. J. 1996. Sax’s Dangerous Properties of Industrial Materials, 9th ed. New York: Van Nostrand Reinhold.)
LD50 oral (rat): 640 mg/kg

Chemical Properties

Cobalt carbonate is Violet Powder. Cobalt (II) carbonate hexahydrate on heating becomes anhydrous by 140 °C while the anhydrous cobalt (II) carbonate decomposes at 427 °C before melting into cobalt (II) oxide.

Uses

Cobalt(II) carbonate is precursor to cobalt carbonyl, cobalt salts and blue pottery glazes such as delftware. It is used as an essential element in dietary supplements and also used in the manufacture of paints and pigments.

Application

Cobalt(II) Carbonate is an inorganic compound that is an intermediate in the hydrometallurgical purification of cobalt from its ore. It is also a paramagnetic solid, an inorganic pigment, and a precursor to catalysts.

Application

Cobalt carbonate is a highly effective colourant used in ceramics as a blue colourant in glazes. It is also a common ingredient in ceramic decals. Cobalt mixed with other colourants such as magnesium and added to glazes produces a more violet/reddish blue colour in oxidation/reduction firings. With this colourant, you can produce blue slips if mixed with white clay bodies. By using this, you can obtain various shades of blue in different intensities. In addition, if mixed with iron and manganese in the right proportions, you can obtain an intense black colour. In general, cobalt is a relatively stable colourant in all kiln atmospheres.

Preparation

Cobalt(II) carbonate is prepared by heating cobaltous sulfate, cobaltous chloride or any Co2+ salt with sodium bicarbonate in solution:
CoSO₄ + NaHCO₃ → CoCO₃ + NaHSO₄

Flammability and Explosibility

Not classified