What is the best way to produce anhydrous ferric chloride?
I'm looking to make some anhydrous ferric chloride for a science experiment, and there are several methods I have read about. One way is to dehydrate FeCl3 hexahydrate in a stream of HCl; another is to pass HCL through heated Fe2O3; and finally to pass chlorine through heated steel wool. Which of these would be the most do-able for an amateur chemist? Right now I'm leaning towards the second method.
Answer:
basically the second and third are the same only the thrid way is much more simple in concept, i would sugest the third and second ways but the Fe2O3 is hard to get in large quanities, HCl however is easy to get
I would follow the third step mixed in with the second, take concentrated HCl and add iron to it- perferabily in a form which is mostly Fe-3- (when buying, ask for high concentrations of this stuff if possible), if not possible heat the iron before hand, the added heat will help in the extra ionization of iron, but not much, also with my experience i suggest using something that can take away the extra heat from the reaction
Preparation and production :
Anhydrous iron(III) chloride may be prepared by union of the elements:[2]
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
Upgrading the iron(II) chloride with chlorine
2 FeCl2(aq) + Cl2(g) → 2 FeCl3(aq)
Alternatively, iron(II) chloride can be oxidised with sulfur dioxide:
32 FeCl2 + 8 SO2 + 32 HCl → 32 FeCl3 + S8 + 16 H2O
Hydrated iron(III) chloride can be converted to the anhydrous salt by heating with thionyl chloride. The hydrate cannot be converted to anhydrous iron(III) chloride by only heat, as instead HCl is evolved and iron oxychloride forms.
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Answer:
basically the second and third are the same only the thrid way is much more simple in concept, i would sugest the third and second ways but the Fe2O3 is hard to get in large quanities, HCl however is easy to get
I would follow the third step mixed in with the second, take concentrated HCl and add iron to it- perferabily in a form which is mostly Fe-3- (when buying, ask for high concentrations of this stuff if possible), if not possible heat the iron before hand, the added heat will help in the extra ionization of iron, but not much, also with my experience i suggest using something that can take away the extra heat from the reaction
Preparation and production :
Anhydrous iron(III) chloride may be prepared by union of the elements:[2]
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
Upgrading the iron(II) chloride with chlorine
2 FeCl2(aq) + Cl2(g) → 2 FeCl3(aq)
Alternatively, iron(II) chloride can be oxidised with sulfur dioxide:
32 FeCl2 + 8 SO2 + 32 HCl → 32 FeCl3 + S8 + 16 H2O
Hydrated iron(III) chloride can be converted to the anhydrous salt by heating with thionyl chloride. The hydrate cannot be converted to anhydrous iron(III) chloride by only heat, as instead HCl is evolved and iron oxychloride forms.
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