3 SO2 (aq) + 6 Na2CO3 (aq) + 2 AuCl3 (aq) → 6 CO2 (g) + 6 NaCl (aq) + 3 Na2SO4 (aq) + 2 Au (s)
This is an oxidation-reduction (redox) reaction:
3 SIV - 6 e- → 3 SVI (oxidation)
2 AuIII + 6 e- → 2 Au0 (reduction)
SO2 is a reducing agent, AuCl3 is an oxidizing agent.
This is a precipitation reaction: Au is the formed precipitate.
This is a gas evolution reaction, CO2 is the formed 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.]
- Na2CO3 – Sodium carbonate
- AuCl3 – Gold(III) trichloride
- NaCl – Sodium chloride