Iron(iii) sulfide likewise called ferric sulfide or iron sesquisulfide is among the members of iron(3+) sulfides v IUPAC surname iron(3+) trisulfide and also chemical formula Fe2S3 <1, 2>. The is a fairly unstable artificial black solid the decomposes and turns into a yellow-green flour at room temperature <2>.

Iron(III) Sulfide Identification

CAS Number12063-27-3 <1>
PubChem CID160957 <1>
ChemSpider ID141408 <3>
EC Number234-367-5 <1>
ChEBI IDCHEBI:75899 <2>

You are watching: Formula for iron (iii) sulfide


Iron(iii) Sulfide Formula

Composition and Synthesis

It is produced by the addition of cooled iron(iii) chloride equipment to refrigerated sodium sulfide solution, as represented by the complying with equation:

2FeCl3 + 3Na2S → Fe2S3 + 6NaCl

It can additionally be synthesized together a by-product that desulfurization of hydrogen sulfide gas that is passed with hydrated iron(iii) oxide:

Fe2O3 + 3H2S + H2O → Fe2S3 + 4H2O


Iron(iii) Sulfide

Reaction v Hydrogen Chloride

It experience a decomposition reaction when combined with hydrochloric mountain <4>:

Fe2S3 + 4HCl → 2FeCl2 + 2H2S + S

Properties and also Characteristics the Iron(III) Sulfide

General Properties

Molar Mass/Molecular Weight207.87 g/mol <1>

Physical Properties

Color and also AppearanceTurns into yellowish-green flour at room temperature <5>
Melting PointDecomposes
Boiling PointN/A <5>
Density4.3 g cm-3 <5>
State of issue at room temperatureSolid <1>
SolubilityModerately soluble in acids
Solubility in WaterVery slightly dissolve in water <1>


As a source of sulfur and also iron(ii) sulfide during the decay of ferric sulfide in ~ room temperature (about 20 °C).


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