Nickel (II) sulfide

Crystal structure
__ Ni 2+      __ S 2−
General
Surname	Nickel (II) sulfide
other names	Nickel monosulfide Nickel sulfide (attention: ambiguous) Sulfur nickel (obsolete)
Ratio formula	NiS
Brief description	odorless black powder
External identifiers / databases
CAS number 16812-54-7 11113-75-0 (alpha nickel sulfide) 1314-04-1 (as fiber dusts of the mineral millerite) PubChem 28094 Wikidata Q1985595
properties
Molar mass	90.76 g mol −1
Physical state	firmly
density	5.66 g cm −3
Melting point	797 ° C
solubility	practically insoluble in water (4 mg l −1 )
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 332-350i-341-372-317-410 P: 201-281-273-302 + 352-309 + 311
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Nickel (II) sulfide is the nickel (II) salt of hydrogen sulfide acid , i.e. a chemical compound from the group of sulfides .

Occurrence

Nickel (II) sulfide occurs naturally in the form of the mineral millerite . It can also arise in glass production as an undesirable inclusion in glass, which can lead to breakage.

Extraction and presentation

Nickel (II) sulphide precipitates from ammoniacal , but not from acidic, nickel-containing solutions with ammonium sulphide and thus serves as a detection reaction.

α-Nickel (II) sulfide can also be produced by reacting nickel (II) chloride hexahydrate in an ammonium chloride solution with hydrogen sulfide in the absence of air.

${\displaystyle \mathrm {NiCl_{2}\cdot 6H_{2}O+H_{2}S\longrightarrow NiS+2\ HCl+6\ H_{2}O} }$

β-Nickel (II) sulfide can be extracted from the elements at 900 ° C.

${\displaystyle \mathrm {Ni+S\longrightarrow NiS} }$

γ-Nickel (II) sulfide can be prepared from nickel sulfate and hydrogen sulfide.

${\displaystyle \mathrm {NiSO_{4}\cdot 7H_{2}O+H_{2}S\longrightarrow NiS+H_{2}SO_{4}+7\ H_{2}O} }$

properties

γ-Nickel (II) sulfide is a black powder. It is poorly soluble in dilute hydrochloric acid. It has a trigonal crystal structure of the millerite type with the space group R 3 m (space group no.160 ) , a = 961.2 pm, c = 325.9 pm, and it goes at 396 ° C in β-nickel (II ) sulfide over. This is also a black powder that is soluble in hot hydrochloric acid. It has a hexagonal crystal structure of the nickel arsenide type with the space group P 6 ₃ / mmc (No. 194) , a = 343.9 pm, c = 534.8 pm. α-Nickel (II) sulfide is an X-ray amorphous black powder that is soluble in hydrochloric acid. It changes to Ni (OH) S in air.

use

Nickel (II) sulfide is used as a mineral for nickel production and as a catalyst .

safety instructions

Like many nickel compounds, nickel sulfide is classified as a carcinogen.

See also

• Trinickel disulfide , Ni ₃ S ₂
• Nickel disulfide , NiS ₂

Individual evidence

1. ↑ ^{a b c d e f} Entry on nickel (II) sulfide in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .
2. ↑ Entry on nickel sulphide in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
3. ↑ VWR: Nickel sulfide, 99.9% (metals basis)
4. ↑ Spontaneous breakage of toughened safety glass (ESG) . In: Baulinks.de , July 17, 2003, accessed December 6, 2012.
5. ↑ ^{a b c d} Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1693.