Nickel(II) carbonate

Nickel(II) carbonate describes one or a mixture of inorganic compounds containing nickel and carbonate. From the industrial perspective, the most important nickel carbonate is basic nickel carbonate with the formula Ni4CO3(OH)6(H2O)4. Simpler carbonates, ones more likely encountered in the laboratory, are NiCO3 and its hexahydrate. All are paramagnetic green solids containing Ni2+ cations. The basic carbonate is an intermediate in the hydrometallurgical purification of nickel from its ores and is used in electroplating of nickel.[3]

Nickel(II) carbonate
Nickel(II) carbonate
Names
IUPAC name
Nickel(II) carbonate
Other names
Nickelous carbonate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.020.063
EC Number
  • 222-068-2
RTECS number
  • QR6200000
UN number 3288
  • InChI=1S/CH2O3.Ni/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 checkY
    Key: ZULUUIKRFGGGTL-UHFFFAOYSA-L checkY
  • InChI=1/CH2O3.Ni/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2
    Key: ZULUUIKRFGGGTL-NUQVWONBAN
  • [Ni+2].[O-]C([O-])=O
Properties
NiCO3
Molar mass 118.7
Appearance light green powder
Density 4.39 g/cm3
Melting point 205 °C (401 °F; 478 K)
decomposes[1]
0.0093 g/100ml
6.6·10−9
Structure
rhombohedral
Hazards
GHS labelling:
GHS07: Exclamation markGHS08: Health hazard[2]
Danger
H302, H312, H315, H317, H319, H332, H334, H335, H350[2]
P201, P261, P280, P305+P351+P338, P308+P313[2]
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
2
0
0
Lethal dose or concentration (LD, LC):
840 mg/kg
Safety data sheet (SDS) ICSC 0927
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Infobox references

Structure and reactions

NiCO3 adopts a structure like calcite, consisting of nickel in an octahedral coordination geometry.[4]

Nickel carbonates are hydrolyzed upon contact with aqueous acids to give solutions containing the ion [Ni(H2O)6]2+, liberating water and carbon dioxide in the process. Calcining (heating to drive off CO2 and water) of these carbonates gives nickel oxide:

NiCO3 → NiO + CO2

The nature of the resulting oxide depends on the nature of the precursor. The oxide obtained from the basic carbonate is often most useful for catalysis.

Basic nickel carbonate can be made by treating solutions of nickel sulfate with sodium carbonate:

4 Ni2+ + CO32− + 6 OH− + 4 H2O → Ni4CO3(OH)6(H2O)4

The hydrated carbonate has been prepared by electrolytic oxidation of nickel in the presence of carbon dioxide:[5]

Ni + O + CO2 + 6 H2O → NiCO3(H2O)4

Uses

Nickel carbonates are used in some ceramic applications and as precursors to catalysts.

Natural occurrence

The natural nickel carbonate is known as gaspéite - a rare mineral. Basic Ni carbonates also have some natural representatives.[6]

Safety

It is moderately toxic and causes low irritation. Avoid prolonged contact.

References
  1. https://www.conncoll.edu/media/website-media/offices/ehs/envhealthdocs/Nickel_Carbonate.pdf
  2. Sigma-Aldrich Co., Nickel(II) carbonate hydroxide tetrahydrate. Retrieved on 2014-05-06.
  3. Keith Lascelles, Lindsay G. Morgan, David Nicholls, Detmar Beyersmann, "Nickel Compounds" in Ullmann's Encyclopedia of Industrial Chemistry Wiley-VCH, Weinheim, 2005. doi:10.1002/14356007.a17_235.pub2
  4. Pertlik, F. (1986). "Structures of hydrothermally synthesized cobalt(II) carbonate and nickel(II) carbonate". Acta Crystallographica Section C. 42: 4–5. doi:10.1107/S0108270186097524.
  5. Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. p. 1557.
  6. "Gaspéite".
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