3 Cu2S + 16 HNO3 → 3 CuSO4 + 3 Cu(NO3)2 + 10 NO + 8 H2O
This is an oxidation-reduction (redox) reaction:
6 CuI - 6 e- → 6 CuII (oxidation)
3 S-II - 24 e- → 3 SVI (oxidation)
10 NV + 30 e- → 10 NII (reduction)
Cu2S is a reducing agent, Cu2S is a reducing agent, HNO3 is an oxidizing agent.
Reactants:
- Cu2S – Copper(I) Sulphide
- 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.]
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