2 SnO2 + 9 S + 2 Na2CO3 → 2 Na2SnS3 + 3 SO2 + 2 CO2
This is an oxidation-reduction (redox) reaction:
6 S0 + 12 e- → 6 S-II (reduction)
3 S0 - 12 e- → 3 SIV (oxidation)
S is both an oxidizing and a reducing agent (disproportionation (dismutation)).
Reactants:
Products:
- Na2SnS3
- 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.]
- CO2