3 FeS + 12 HNO3 → Fe(NO3)3 + 9 NO + Fe2(SO4)3 + 6 H2O
This is an oxidation-reduction (redox) reaction:
3 S-II - 24 e- → 3 SVI (oxidation)
9 NV + 27 e- → 9 NII (reduction)
3 FeII - 3 e- → 3 FeIII (oxidation)
FeS is a reducing agent, HNO3 is an oxidizing agent, FeS is a reducing agent.
Reactants:
- FeS
- 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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