3 As2O3 + 4 HNO3 + 7 H2O → 6 H3AsO4 + 4 NO
This is an oxidation-reduction (redox) reaction:
6 AsIII - 12 e- → 6 AsV (oxidation)
4 NV + 12 e- → 4 NII (reduction)
As2O3 is a reducing agent, HNO3 is an oxidizing agent.
Reactants:
- As2O3 – Diarsenic trioxide
- 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.]
- H2O – Water, oxidane
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