Iron(III) sulfide

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Iron(III) sulfide
IUPAC name
Iron(III) sulfide
Other names
Iron sesquisulfide

Ferric sulfide

Diiron trisulfide
12063-27-3 YesY
PubChem 160957
Molar mass 207.90 g/mol [1]
Appearance yellow-green [1]
Density 4.3 g/cm3 [1]
Melting point decomposition [1]
very slightly soluble [1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Iron(III) sulfide, also known as ferric sulfide or sesquisulfide, is one of the three iron sulfides besides FeS and FeS2. It is a solid, black powder but decays at ambient temperature into a yellow-green powder.

This is a relatively unstable artificial product that does not occur in nature.

Preparation and properties[edit]

Fe2S3 is prepared by addition of refrigerated iron(III) chloride solution to also cooled sodium sulfide solution.

2 FeCl3 + 3 Na2S → Fe2S3↓ + 6 NaCl

which decays at a temperature over 20°C into FeS and sulphur.[2]

Fe2S3 → 2 FeS + S↓

With hydrochloric acid it decays according to the following reaction equation:[3]

Fe2S3 + 4 HCl → 2 FeCl2 + 2 H2S↑ + S↓


  1. ^ a b c d e Charles D. Hodgman, Handbook of Chemistry and Physics (1961), p.590
  2. ^ Holleman, Wiberg: Inorganic Chemistry (2001), p. 1451; ISBN 0-12-352651-5
  3. ^ H. Roempp, Chemie (1997), S. 1099; ISBN 3-13-734710-6