2 KI (aq) + 2 H2SO4 (aq) → SO2 (aq) + I2 (s) + K2SO4 (aq) + 2 H2O (l)
This is an oxidation-reduction (redox) reaction:
SVI + 2 e- → SIV (reduction)
2 I-I - 2 e- → 2 I0 (oxidation)
H2SO4 is an oxidizing agent, KI is a reducing agent.
This is a precipitation reaction: I2 is the formed precipitate.
Reactants:
Products:
- 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.]
- I2
- K2SO4
- H2O – Water, oxidane