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NiSO4 hexahydrate crystals
| IUPAC name
| Systematic IUPAC name
| Other names
| NiSO4 (anhydrous)|
NiSO4·6 H2O (hexahydrate)
NiSO4·7 H2O (heptahydrate)
|Molar mass|| 154.75 g/mol (anhydrous)|
262.85 g/mol (hexahydrate)
280.86 g/mol (heptahydrate)
|Appearance|| Yellow solid (anhydride)|
Blue crystals (hexahydrate)
Blue-green crystals (heptahydrate)
|Density|| 4.01 g/cm3 (anhydrous)|
2.07 g/cm3 (hexahydrate)
1.948 g/cm3 (heptahydrate)
|Melting point|| 100 °C (127 °F; 326 K) (anhydrous)|
53 °C (127 °F; 326 K) (hexahydrate, decomposes)
|Boiling point||840 °C (1,540 °F; 1,110 K) (anhydrous, decomposes)|
65 g/100 ml (20 °C)
77.5 g/100 ml (30 °C)
Insoluble in acetone, diethyl ether, ethanol
Insoluble in ammonia, diethyl ether, ethanol
Soluble in ethanol, methanol
Insoluble in acetone, diethyl ether, ethyl acetate
|Acidity (pKa)||4.5 (hexahydrate)|
|Safety data sheet|| Sigma-Aldrich (anhydrous)|
| Nickel(II) chloride|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Nickel(II) sulfate is inorganic salt of nickel with formula NiSO4. Nickel sulfate has many forms, anhydride, hexahydrate and heptahydrate. In nature occurs as rare mineral retgersite (hexahydrate) or morenosite (heptahydrate).
Nickel sulfate is a yellow, green or blue colored, crystalline inorganic compound that produces toxic gases upon heating. Nickel sulfate is used in electroplating and as a chemical intermediate to produce other nickel compounds.
Anhydrous nickel sulfate is a yellow-green crystalline solid. Nickel sulfate can also be obtained as a hexahydrate which is blue to emerald green, and as a heptahydrate (NiSO4·7H2O), which is green. Samples can contain variable quantities of water, depending on their previous exposure to moisture or conditions. All forms of nickel sulfate, anhydrous or hydrated are mildly toxic and are carcinogenic. All forms of nickel sulfate, anhydrous or hydrated are paramagnetic.
Nickel(II) sulfate is sold by many chemical suppliers.
- Growing crystals
- Nickel plating
- Make nickel carbonate
- Make nickel coordination complexes
Exposure to this substance can cause severe dermatitis, skin and asthma-like allergies and affects the lungs, kidneys, gastrointestinal tract and neurological system. Nickel sulfate is a known carcinogen and is associated with an increased risk of developing lung and nasal cancers.
Nickel(II) sulfate is best stored in closed bottles.
Nickel(II) sulfate should be reduced to an insoluble form and taken to disposal centers. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment.