Preparation
Anhydrous iron(III) chloride may be prepared by union of the elements:
- 2 Fe(s) + 3 Cl2(g) → 2 FeCl3(s)
Solutions of iron(III) chloride are produced industrially both from iron and from ore, in a closed-loop process.
- Dissolving pure iron in a solution of iron(III) chloride
- Fe(s) + 2 FeCl3(aq) → 3 FeCl2(aq)
- Dissolving iron ore in hydrochloric acid
- Fe3O4(s) + 8 HCl(aq) → FeCl2(aq) + 2 FeCl3(aq) + 4 H2O
- Oxidation of iron (II) chloride with chlorine
- 2 FeCl2(aq) + Cl2(g) → 2 FeCl3(aq)
Like many other hydrated metal chlorides, hydrated iron(III) chloride can be converted to the anhydrous salt by refluxing with thionyl chloride. Conversion of the hydrate to anhydrous iron(III) chloride is not accomplished by heating, as HCl and iron oxychlorides are produced.
Read more about this topic: Iron(III) Chloride
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