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Cobalt II Carbonate Formula

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  • Last Updated : 13 Oct, 2022
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Cobalt (II) carbonate is an inorganic compound that is also known as cobaltous carbonate. It is a reddish paramagnetic solid whose chemical or molecular formula is CoCO3. Its molecular weight is 118.941 g/mol and it has a density of 4.13 g/cm3. It is an intermediate in obtaining cobalt from their ores by hydrometallurgical purification. Spherocobaltite or sphaerocobaltite is a cobalt carbonate mineral that exists in a rose-red colour in its rare pure form, while its impure specimens exist in shades of pink to pale brown. 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. It is soluble in acids and liquid ammonia, almost insoluble in alcohol, methyl acetate, water, and decomposes in hot water, and is insoluble in ethanol. It is used in the preparation of cobalt compounds, ceramics, pigments, fertilizers, and catalysts.

Structure of Cobalt II Carbonate

The molecular formula of cobalt II carbonate is CoCO3, and its canonical SMILES is C(=O)([O-])[O-].[Co+2]. The crystal structure of cobalt II carbonate (anhydrous) is rhombohedral, and cobalt II carbonate hexahydrate is trigonal.

Structure of Cobalt II Carbonate

Structure of Cobalt II Carbonate

Preparation of Cobalt II Carbonate

  • Cobalt II carbonate can be prepared by combining solutions of cobaltous sulfate and sodium bicarbonate. The below reaction is used in the precipitation of cobalt from an extract of its roasted ores.

CoSO4 + 2NaHCO3 → CoCO3 + Na2SO4 + H2O + CO2

  • It can also be prepared by heating a solution of a cobaltous salt with sodium carbonate. For example, cobalt (II) nitrate reacts with sodium carbonate to form Cobalt (II) carbonate and sodium nitrate.

Na2CO3 + Co(NO3)2 → CoCO3 + 2NaNO3

Physical Properties of Cobalt II Carbonate

Chemical formula  CoCO3 
IUPAC Name Cobalt (II) carbonate 
Molar mass 118.941 g/mol 
Appearance  Red-pink solid  
Structure Rhombohedral crystals 
Melting point 427 °C
Density 4.13 g/cm3
Solubility Soluble in acids and liquid ammonia, almost insoluble in water, alcohol, methyl acetate, and Insoluble in ethanol 
Refractive index 1.855

Chemical Properties of Cobalt II Carbonate

  • Cobalt III Carbonate (Co2(CO3)3) is formed when cobalt II carbonate is oxidized by air on weak oxidizing agents.
  • Cobalt (II) carbonate and hydrochloric acid react in an aqueous solution to form Cobalt chloride.

CoCO3 + 2HCl(aq) → CoCl2(aq) + CO2 + H2O

  • Cobalt chloride hexahydrate can be prepared from the reaction of cobalt II carbonate and hydrochloric acid in an aqueous solution. 

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

  • When cobalt (II) carbonate and acetylacetone (C5H8O2) react in the presence of hydrogen peroxide, tris(acetylacetonate)cobalt(III) [Co(C5H7O2)3] is produced.

 2CoCO3 + H2O2 + 15C5H8O2 → 2 Co(C5H7O2)3 + 2CO2 + 4H2

  • When cobalt (II) carbonate is heated, it emits carbon dioxide and produces cobalt (IV) oxide, which converts reversibly to cobalt oxide (CoO) at high temperatures.

6CoCO3 + O2 → 2 Co3O4 + 6CO2

Uses of Cobalt(II) carbonate

  • Cobalt(II) carbonate is used in the preparation of various cobalt compounds.
  • It is used in porcelain colouring, pigments, fertilizers, and catalysts.
  • It is used as a temperature indicator and veterinary medication.
  • As cobalt is an essential element, it is a component of dietary supplements.
  • It is also used in animal feeds as cobalt carbonate aids in the production of vitamin B12 in ruminants such as cattle and sheep.

Hazards

  • Cobalt(II) carbonate powder may irritate the skin, eye, and/or respiratory tract. 
  • Prolonged contact may cause an allergic skin reaction. 
  • It is harmful if swallowed and may cause allergy or asthma symptoms or breathing difficulties if inhaled. 

FAQs on Cobalt II Carbonate Formula

Question 1: What is cobalt(II) carbonate?

Answer:

Cobalt (II) carbonate is an inorganic compound that is also known as cobaltous carbonate. It is a reddish paramagnetic solid whose chemical or molecular formula is CoCO3. Its molecular weight is 118.941 g/mol and it has a density of 4.13 g/cm3. It is an intermediate in obtaining cobalt from their ores by hydrometallurgical purification. Spherocobaltite or spherocobaltite is a cobalt carbonate mineral that exists in a rose-red color in its rare pure form, while its impure specimens exist in shades of pink to pale brown.

Question 2: Mention a preparation method for cobalt(II) carbonate.

Answer:

Cobalt II carbonate can be prepared by combining solutions of cobaltous sulfate and sodium bicarbonate. The below reaction is used in the precipitation of cobalt from an extract of its roasted ores.

CoSO4 + 2NaHCO3 → CoCO3 + Na2SO4 + H2O + CO2

Question 3: What happens when cobalt(II) carbonate reacts with acetylacetone in the presence of hydrogen peroxide?

Answer:

When cobalt (II) carbonate and acetylacetone (C5H8O2) react in the presence of hydrogen peroxide, tris(acetylacetonato)cobalt(III) [Co(C5H7O2)3] is produced.

2CoCO3 + H2O2 + 15C5H8O2 → 2 Co(C5H7O2)3 + 2CO2 + 4H2

Question 4: What are the uses of cobalt(II) carbonate?

Answer:

Cobalt(II) carbonate is used in the preparation of various cobalt compounds. It is used in porcelain coloring, pigments, fertilizers, and catalysts. It is used as a temperature indicator and veterinary medication. As cobalt is an essential element, it is a component of dietary supplements. It is also used in animal feeds as cobalt carbonate aids in the production of vitamin B12 in ruminants such as cattle and sheep.

Question 5: Mention some health hazards of cobalt(II) carbonate.

Answer:

Cobalt(II) carbonate powder may irritate the skin, eye, and/or respiratory tract. Prolonged contact may cause an allergic skin reaction. It is harmful if swallowed and may cause allergy or asthma symptoms or breathing difficulties if inhaled.

Question 6: How is cobalt chloride hexahydrate prepared from cobalt(II) carbonate?

Answer:

Cobalt chloride hexahydrate can be prepared from the reaction of cobalt II carbonate and hydrochloric acid in an aqueous solution.

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

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