2 HClO4 (l) + 7 SO2 (aq) + 6 H2O (l) → 7 H2SO4 (aq) + Cl2 (g)
This is an oxidation-reduction (redox) reaction:
7 SIV - 14 e- → 7 SVI (oxidation)
2 ClVII + 14 e- → 2 Cl0 (reduction)
SO2 is a reducing agent, HClO4 is an oxidizing agent.
Reactants:
- HClO4 – Chloric(VII) acid
- 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.]
- H2O – Water, oxidane
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