3 As + 5 HNO3 + 2 H2O 3 H3AsO4 + 5 NO

This is an oxidation-reduction (redox) reaction:

3 As0 - 15 e- 3 AsV (oxidation)

5 NV + 15 e- 5 NII (reduction)

As is a reducing agent, HNO3 is an oxidizing agent.

Reactants:

  • As
    • Names: Arsenic source: ICSC, accessed on: 2019-09-04, Grey arsenic source: ICSC, accessed on: 2019-09-04
    • Appearance: Brittle grey metallic-looking crystals source: ICSC, accessed on: 2019-09-04
  • HNO3Nitric acid source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: NIOSH NPG, accessed on: 2019-09-02
    • Other names: Aqua fortis source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: NIOSH NPG, accessed on: 2019-09-02, Spirit of niter source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Eau forte source: wikipedia, accessed on: 2019-09-27
    • Appearance: Colorless, yellow or red fuming liquid source: wikipedia, accessed on: 2019-09-27; Colourless-to-yellow liquid with pungent odour source: ICSC, accessed on: 2019-09-04; 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.] source: NIOSH NPG, accessed on: 2019-09-02
  • H2OWater, oxidane source: wikipedia, accessed on: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed on: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed on: 2019-09-27, Hydrogen oxide source: wikipedia, accessed on: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed on: 2019-09-27

Products:

  • H3AsO4Arsenic acid, arsoric acid source: wikipedia, accessed on: 2019-09-27
    • Other names: Arsenic acid source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Orthoarsenic acid source: wikipedia, accessed on: 2019-09-27, Desiccant L-10 source: wikipedia, accessed on: 2019-09-27
    • Appearance: White translucent crystals | hygroscopic. source: wikipedia, accessed on: 2019-09-27; Colourless-to-pale-green-viscous liquid source: ICSC, accessed on: 2019-09-04
  • NONitrogen monoxide source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: NIOSH NPG, accessed on: 2019-09-02, Oxidonitrogen(•) (additive) source: wikipedia, accessed on: 2019-09-27
    • Other names: Nitric oxide source: wikipedia, accessed on: 2019-09-27source: ICSC, accessed on: 2019-09-04source: NIOSH NPG, accessed on: 2019-09-02source: wikidata, accessed on: 2019-09-02, Nitrogen(II) oxide source: wikipedia, accessed on: 2019-09-27, Nitric oxide (radical) source: wikidata, accessed on: 2019-09-02
    • Appearance: Colourless gas source: wikipedia, accessed on: 2019-09-27; Colourless compressed gas source: ICSC, accessed on: 2019-09-04; Colorless gas. [Note: Shipped as a nonliquefied compressed gas.] source: NIOSH NPG, accessed on: 2019-09-02