3 As2S + 16 HNO3 + 4 H2O → 6 H3AsO4 + 16 NO + 3 H2SO4
This is an oxidation-reduction (redox) reaction:
6 As-III - 48 e- → 6 AsV (oxidation)
16 NV + 48 e- → 16 NII (reduction)
As2S is a reducing agent, HNO3 is an oxidizing agent.
Reactants:
- As2S
- 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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