FeS + 4 HNO3 → Fe(NO3)3 + S + NO + 2 H2O
This is an oxidation-reduction (redox) reaction:
S-II - 2 e- → S0 (oxidation)
NV + 3 e- → NII (reduction)
FeII - 1 e- → 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.]
Products: