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( T o p )
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A p p e a r a n c e
F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
Iron(II ) sulfide
Names
Other names
Iron sulfide, ferrous sulfide, black iron sulfide, protosulphuret of iron
Identifiers
CAS Number
3D model (JSmol )
ChemSpider
ECHA InfoCard 100.013.881
PubChem CID
UNII
CompTox Dashboard (EPA )
InChI=1S/Fe.S/q+2;-2 Y
Key: GNVXPFBEZCSHQZ-UHFFFAOYSA-N Y
Key: GNVXPFBEZCSHQZ-UHFFFAOYAC
Properties
Chemical formula
FeS
Molar mass
87.910 g/mol
Appearance
Grey, sometimes in lumps or powder
Density
4.84 g/cm3
Melting point
1,194 °C (2,181 °F; 1,467 K )
Solubility in water
negligible (insoluble)
Solubility
reacts in acid
Magnetic susceptibility (χ)
+1074·10−6 cm 3
Hazards
Occupational safety and health
Main hazards
Source of hydrogen sulfide , can be pyrophoric
NFPA 704
Autoignition
variable
Related compounds
Other anions
Iron(II ) oxide Iron(II ) selenide Iron(II ) telluride
Other cations
Manganese(II ) sulfide Cobalt(II ) sulfide
Related Iron sulfides
Iron(III) sulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound
Iron(II ) sulfide or ferrous sulfide (Br.E. sulphide ) is one of a family of chemical compounds and minerals with the approximate formula Fe S non-stoichiometric . All are black, water-insoluble solids.
Preparation and structure [ edit ]
FeS can be obtained by the heating of iron and sulfur :[1]
Fe + S → FeS
FeS adopts the nickel arsenide structure, featuring octahedral Fe centers and trigonal prismatic sulfide sites.
Reactions [ edit ]
Iron sulfide reacts with hydrochloric acid , releasing hydrogen sulfide :[2]
FeS + 2 HCl → FeCl2 2 S
FeS + H2 SO 4 4 2 S
In moist air, iron sulfides oxidize to hydrated ferrous sulfate .
Biology and biogeochemistry [ edit ]
An overcooked hard-boiled egg , showing the distinctive green coating on the yolk caused by the presence of iron(II ) sulfide
Iron sulfides occur widely in nature in the form of iron–sulfur proteins .
As organic matter decays under low-oxygen (or hypoxic ) conditions such as in swamps or dead zones of lakes and oceans, sulfate-reducing bacteria reduce various sulfates present in the water, producing hydrogen sulfide . Some of the hydrogen sulfide will react with metal ions in the water or solid to produce iron or metal sulfides, which are not water-soluble. These metal sulfides, such as iron(II ) sulfide, are often black or brown, leading to the color of sludge.
Pyrrhotite is a waste product of the Desulfovibrio
When eggs are cooked for a long time, the yolk 's surface may turn green. This color change is due to iron(II ) sulfide, which forms as iron from the yolk reacts with hydrogen sulfide released from the egg white by the heat.[3] [4]
The presence of ferrous sulfide as a visible black precipitate in the growth medium peptone iron agar can be used to distinguish between microorganisms that produce the cysteine metabolizing enzyme cysteine desulfhydrase and those that do not. Peptone iron agar contains the amino acid cysteine and a chemical indicator , ferric citrate . The degradation of cysteine releases hydrogen sulfide gas that reacts with the ferric citrate to produce ferrous sulfide.
See also [ edit ]
References [ edit ]
^ H. Lux "Iron (II ) Sulfide" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1502.
^ Hydrogen Sulfide Generator
^ Belle Lowe (1937), "The formation of ferrous sulfide in cooked eggs", Experimental cookery from the chemical and physical standpoint
^ Harold McGee (2004), McGee on Food and Cooking
t
e
Fe(-II)
Fe(0)
Fe(I )
Fe(0,II)
Fe(II )
Fe(0,III)
Fe(II,III)
Fe(III)
Organoiron(III) compounds
Fe(IV )
Fe(VI )
Purported
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a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
