3 Fe3O4 + 28 HNO3 → 9 Fe(NO3)3 + NO + 14 H2O
This is an acid-base reaction (neutralization): Fe3O4 is a base, HNO3 is an acid.
This is an oxidation-reduction (redox) reaction:
NV + 3 e- → NII (reduction)
9 Fe8/3 - 3 e- → 9 FeIII (oxidation)
HNO3 is an oxidizing agent, Fe3O4 is a reducing agent.
Reactants:
- Fe3O4 – Iron(II) iron(III) oxide
- 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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