2 P + HClO3 + 3 H2O → 2 H3PO3 + HCl
This is an oxidation-reduction (redox) reaction:
2 P0 - 6 e- → 2 PIII (oxidation)
ClV + 6 e- → Cl-I (reduction)
P is a reducing agent, HClO3 is an oxidizing agent.
Reactants:
Products:
- H3PO3 – Phosphonic acid
- HCl – Chlorane , Hydrogen chloride
- Other names: Hydrochloric acid , M , Uriatic acid
- 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.]