Nickel(II) sulfate

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Template:Chembox header | Nickel(II) Sulfate
Photo of nickel(II) chloride hexahydrate Nickel(II) chloride hexahydrate
Template:Chembox header | General
Systematic name Nickel(II) sulfate, hexahydrate
Molecular formula NiSO4.6H2O
Molar mass g/mol 262.85 g/mol (hexahydrate)
Appearance Blue crystals (hexahydrate)
CAS number [10101-97-0] (hexahydrate)
EINECS number *
Template:Chembox header | Properties
Density and phase 2.07 g/cm3 (hexahydrate)
Solubility in water highly soluble
Solubility in ethanol sparingly (hexahydrate)
Melting point decomp. >100 °C
Template:Chembox header | Structure
octahedral at Ni
Crystal structure Monoclinic?
Template:Chembox header | Thermodynamic data
Standard enthalpy
of formation
* kJ/mol
(anhyd form)
Standard molar entropy
* J.K−1.mol−1
for the hexahydrate?
Template:Chembox header | Safety data
NFPA 704 Template:NFPA 704
EU classification not listed
Safety statements 22-36/37-60-61
Risk statements 22-40-42/43-50/53
RTECS number QR9600000
Template:Chembox header | Supplementary data page
Phase behaviour
Spectral data UV
Template:Chembox header | Related compounds
Other anions Nickel(II) bromide
Nickel(II) chloride
Other cations Copper(II) sulfate
Cobalt(II) sulfate
Template:Chembox header | Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
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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.

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+.

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.


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


Nickel salts are considered carcinogenic.


  1. Wells, A. F. (1984). Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.

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