2 HCl (aq) + H2O2 (aq) + 2 KI (aq) → 2 H2O (l) + I2 (s) + 2 KCl (aq)
This is an oxidation-reduction (redox) reaction:
2 I-I - 2 e- → 2 I0 (oxidation)
2 O-I + 2 e- → 2 O-II (reduction)
KI is a reducing agent, H2O2 is an oxidizing agent.
This is a precipitation reaction: I2 is the formed precipitate.
- HCl – Chlorane , Hydrogen chloride
- Other names: Hydrochloric acid , Hydrochloric acid gas , HCl
- Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
- H2O2 – Hydrogen peroxide
- H2O – Water, oxidane