3 CuS + 8 HNO3 3 CuSO4 + 8 NO + 4 H2O

This is an oxidation-reduction (redox) reaction:

3 S-II - 24 e- 3 SVI (oxidation)

8 NV + 24 e- 8 NII (reduction)

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

Reactants:

  • CuSCopper sulfide source: wikipedia, accessed: 2019-09-27
    • Other names: Copper monosulfide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Covellite source: wikipedia, accessed: 2019-09-27, Copper(II) sulfide source: wikipedia, accessed: 2019-09-27, Cupric sulfide source: wikipedia, accessed: 2019-09-27
    • Appearance: Black powder or lumps source: wikipedia, accessed: 2019-09-27
  • HNO3Nitric acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Aqua fortis source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02, Spirit of niter source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Eau forte source: wikipedia, accessed: 2019-09-27
    • Appearance: Colorless, yellow or red fuming liquid source: wikipedia, accessed: 2019-09-27; Colourless-to-yellow liquid with pungent odour source: ICSC, accessed: 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: 2019-09-02

Products:

  • CuSO4Copper(II) sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Cupric sulphate source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Blue vitriol (pentahydrate) source: wikipedia, accessed: 2019-09-27, Bluestone (pentahydrate) source: wikipedia, accessed: 2019-09-27
    • Appearance: Gray-white (anhydrous) | blue (pentahydrate) source: wikipedia, accessed: 2019-09-27; White hygroscopic crystals source: ICSC, accessed: 2019-09-04
  • NONitrogen monoxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02, Oxidonitrogen(•) (additive) source: wikipedia, accessed: 2019-09-27
    • Other names: Nitric oxide source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02source: wikidata, accessed: 2019-09-02, Nitrogen(II) oxide source: wikipedia, accessed: 2019-09-27, Nitric oxide (radical) source: wikidata, accessed: 2019-09-02
    • Appearance: Colourless gas source: wikipedia, accessed: 2019-09-27; Colourless compressed gas source: ICSC, accessed: 2019-09-04; Colorless gas. [Note: Shipped as a nonliquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02
  • H2OWater, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27