CuS + 4 H2SO4 → CuSO4 + 4 SO2 + 4 H2O
This is an oxidation-reduction (redox) reaction:
S-II - 6 e- → SIV (oxidation)
3 SVI + 6 e- → 3 SIV (reduction)
CuS is a reducing agent, H2SO4 is an oxidizing agent (synproportionation (comproportionation)).
Reactants:
Products:
- CuSO4 – Copper(II) sulfate
- 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