H3PO2 + 4 AgNO3 + 2 H2O → H3PO4 + 4 Ag + 4 HNO3
This is an oxidation-reduction (redox) reaction:
PI - 4 e- → PV (oxidation)
4 AgI + 4 e- → 4 Ag0 (reduction)
H3PO2 is a reducing agent, AgNO3 is an oxidizing agent.
Reactants:
Products:
- H3PO4
- Ag
- HNO3 – Nitric acid
- Other names: Aqua fortis , Spirit of niter , Eau forte
- Appearance: Colorless, yellow or red fuming liquid ; Colourless-to-yellow liquid with pungent odour ; Colorless, yellow, or red, fuming liquid with an acrid, suffocating odor. [Note: Often used in an aqueous solution. Fuming nitric acid is concentrated nitric acid that contains dissolved nitrogen dioxide.]