CuS (s) + 2 HNO3 (aq) → Cu (s) + 2 NO (g) + H2SO4 (aq)
This is an oxidation-reduction (redox) reaction:
CuII + 2 e- → Cu0 (reduction)
S-II - 8 e- → SVI (oxidation)
2 NV + 6 e- → 2 NII (reduction)
CuS is an oxidizing agent, CuS is a reducing agent, HNO3 is an oxidizing agent.
Reactants:
- CuS – Copper sulfide
- 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.]
Products: