3 Cu2S*FeS2 + 46 HNO3 → 3 Fe(NO3)3 + 6 Cu(NO3)2 + 25 NO + 9 H2SO4 + 14 H2O
This is an oxidation-reduction (redox) reaction:
9 S-II - 72 e- → 9 SVI (oxidation)
25 NV + 75 e- → 25 NII (reduction)
3 FeII - 3 e- → 3 FeIII (oxidation)
Reactants:
- Cu2S*FeS2
- 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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