PCl3 (l) + 4 H2O (l) + Br2 (aq) → 2 HBr (aq) + H3PO4 (aq) + 3 HCl (aq)
This is an oxidation-reduction (redox) reaction:
PIII - 2 e- → PV (oxidation)
2 Br0 + 2 e- → 2 Br-I (reduction)
PCl3 is a reducing agent, Br2 is an oxidizing agent.
Reactants:
Products:
- HBr – Hydrogen bromide , Bromane
- H3PO4
- 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.]