3 HCl (aq) + HNO3 (aq) → NOCl (g) + Cl2 (g) + 2 H2O (l)
This is an oxidation-reduction (redox) reaction:
2 Cl-I - 2 e- → 2 Cl0 (oxidation)
NV + 2 e- → NIII (reduction)
HCl is a reducing agent, HNO3 is an oxidizing agent.
This is a gas evolution reaction, NOCl and Cl2 is the formed gas.
- HCl – Chlorane , Hydrogen chloride
- Other names: Hydrochloric acid , Hydrochloric acid gas , HCl
- Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
- 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.]
- NOCl – Nitrosyl chloride
- H2O – Water, oxidane