Nickel(II) sulfate

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Safety data
IUPAC name	Nickel(II) sulfate, hexahydrate
Identifiers
CAS number	[10101-97-0] (hexahydrate)
EINECS number	*
RTECS number	QR9600000
Properties
Molecular formula	NiSO4.6H2O
Appearance	Blue crystals (hexahydrate)
Density	2.07 g/cm3 (hexahydrate)
Melting point	decomp. >100 °C
Solubility in water	highly soluble
Solubility in ethanol	sparingly (hexahydrate)
Structure
Crystal structure	Monoclinic?
Coordination geometry	octahedral at Ni
Hazards
MSDS	ScienceLab.com
EU classification	not listed
NFPA 704	0 2 0
R-phrases	22-40-42/43-50/53
S-phrases	22-36/37-60-61
Related compounds
Other anions	Nickel(II) bromide Nickel(II) chloride
Other cations	Copper(II) sulfate Cobalt(II) sulfate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Nickel(II) sulfate or just nickel sulfate, usually refers to the chemical compound with the formula NiSO₄^.6H₂O. This blue salt is a common laboratory source of nickel. It also occurs as the rare mineral Retgersite. The anhydrous salt, NiSO₄, a high melting solid, is also known but is less commonly encountered. These nickel(II) compounds are paramagnetic.

Contents 1 Synthesis and structure 2 Coordination chemistry 3 Applications 4 Safety 5 References

[edit] Synthesis and structure

Dissolution of nickel hydroxide in sulfuric acid followed by evaporation produces crystals of this salt or the corresponding heptahydrate. X-ray crystallography measurements show that NiSO₄^.6H₂O consists of octahedral [Ni(H₂O)₆]²⁺ ions. These ions in turn are hydrogen bonded to sulfate ions.^[1] Dissolution of the salt in water gives solutions containing the ion [Ni(H₂O)₆]²⁺.

[edit] Coordination chemistry

NiSO₄^.6H₂O and related hydrates react with ammonia to give [Ni(NH₃)₆]SO₄ and with ethylenediamine to give [Ni(H₂NCH₂CH₂NH₂)₃]SO₄. The latter is occasionally used as a calibrant for magnetic susceptibility measurements because it has no tendency to hydrate.

[edit] Applications

NiSO₄^.6H₂O in combination with boric acid or nickel(II) chloride is used in some electroplating baths.

[edit] Safety

Nickel salts are considered carcinogenic.

[edit] References