4 H2SO4 (aq) + 2 FeCl2 (aq) → 2 H2O (l) + 4 HCl (aq) + SO2 (aq) + Fe2(SO4)3 (s)
This is an oxidation-reduction (redox) reaction:
SVI + 2 e- → SIV (reduction)
2 FeII - 2 e- → 2 FeIII (oxidation)
H2SO4 is an oxidizing agent, FeCl2 is a reducing agent.
This is a precipitation reaction: Fe2(SO4)3 is the formed precipitate.
- H2SO4 – Sulfuric acid
- FeCl2 – Iron(II) chloride , Iron dichloride
- H2O – Water, oxidane
- HCl – Chlorane , Hydrogen chloride
- Other names: Hydrochloric acid , Hydrochloric acid gas , HCl
- Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
- SO2 – Sulfur dioxide
- Other names: Sulfurous anhydride , Sulphur dioxide , Sulfurous acid anhydride
- Appearance: Colorless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]
- Fe2(SO4)3 – Iron(III) sulfate