3 As2S5 + 10 HNO3 + 4 H2O → 15 S + 6 H3AsO4 + 10 NO
This is an oxidation-reduction (redox) reaction:
15 S-II - 30 e- → 15 S0 (oxidation)
10 NV + 30 e- → 10 NII (reduction)
As2S5 is a reducing agent, HNO3 is an oxidizing agent.
Reactants:
- As2S5 – Arsenic pentasulfide
- 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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