Product Name
Iron(II) sulfide
Category
Metal & Ceramic Materials
Synonyms
Iron(II) sulfide; Iron(II) sulfide, 99.9%, (trace metal basis), -100 mesh; Iron sulfide (FeS); Ferrous sulfide (FeS); Iron(II) sulfide, 29.0%; EC 215-268-6; Iron(II) sulfide (99.9%-Fe); Iron sulfide, troilite; Iron(II) sulfide, sticks, >=95% FeS basis; 8658AF;
IUPAC Name
sulfanylideneiron;
Molecular Weight
87.905g/mol
Molecular Formula
FeS;FeS;
InChI Key
MBMLMWLHJBBADN-UHFFFAOYSA-N;
Solubility
0.00062 G/100 CC WATER AT 18 DEG C; INSOL IN NITRIC ACID; SOL IN ACIDS WITH EVOLUTION OF HYDROGEN SULFIDE;
Application
Iron(II) sulfide reacts with acids evolving hydrogen sulfide:
FeS + 2HCl → H2S + FeCl2
The compound is readily oxidized under moist condition by action of air, forming triiron tetroxide and elemental sulfur:
3FeS + 2O2 → Fe3O4 + 3S
The above reaction is exothermic.
Iron(II) sulfide decomposes to its elements when heated above 1,100°C:
FeS → Fe + S
When heated with boiled water, it generates sulfuric acid and hydrogen:
4FeS + 8H₂O + 7O2 → 4H₂SO₄ + 4H2 + Fe2O3
Storage
Storage temperature: no restrictions.
Color/Form
Colorless hexagonal crystals when pure; usually gray to brownish-black lumps, rods or granular powder; trimorphic with transition points @ 135 and 325 deg C;Dark-brown or black metallic pieces, sticks, or granules;
Covalently-Bonded Unit Count
1
Decomposition
When heated to decomposition it emits toxic fumes of /sulfur oxides/.;
Monoisotopic Mass
87.907g/mol
Other Experimental
Decomposes in hot water;Oxidized by moist air to S and Fe3O4.;Standard molar enthalpy (heat) of formation at 298.15 deg K is -100.0 kJ/mol (crystal); Standard molar Gibbs energy of formation at 298.15 deg K is -100.4 kJ/mol (crystal); Standard molar entropy at 298.15 deg K is 60.3 J/mol/K (crystal); Molar heat capacity at constant pressure at 298.15 deg K is 50.5 J/mol/K (crystal);Molar enthalpy (heat) of fusion 31.5 kJ/mol at 1188 deg C;Sugar, glycerin, & many organic hydroxy acids hinder precipitation. In neutral solution, soluble carbonates, phosphates, & oxalates produce precipitation. /Ferrous salts/;
Stability
Oxidized by moist air to sulfur and iron oxide.;
Topological Polar Surface Area
32.1A^2