4 HNO3 + 3 HI → 3 HIO2 + 4 NO + 2 H2O
This is an oxidation-reduction (redox) reaction:
3 I-I - 12 e- → 3 IIII (oxidation)
4 NV + 12 e- → 4 NII (reduction)
HI is a reducing agent, HNO3 is an oxidizing agent.
Reactants:
- 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.]
- HI – Iodane
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