8 HCl + 2 HNO₃ + 8 FeCl₂ → 5 H₂O + 8 FeCl₃ + N₂O

This is an oxidation-reduction (redox) reaction:

HNO₃ is an oxidizing agent, FeCl₂ is a reducing agent.

Reactants:

• HCl – Chlorane , Hydrogen chloride
  • Other names: Hydrochloric acid , Hydrochloric acid gas , HCl ... show moreAnhydrous hydrogen chloride , Hydrochloric acid, anhydrous , Aqueous hydrogen chloride , [Note: Often used in an aqueous solution.] show less
  • 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 ... show moreHydrogen nitrate , Acidum nitricum , Nitric acid (> 70% in water) , Fuming nitric acid , Engravers acid , HONO2 , Red fuming nitric acid , RFNA , White fuming nitric acid (WFNA) show less
  • 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.]
• FeCl₂ – Iron(II) chloride , Iron dichloride
  • Other names: Ferrous chloride , Rokühnite , [FeCl3] , FeCl3
  • Appearance: Tan solid (anhydrous) | Pale green solid (di-tetrahydrate) ; White-to-light-green hygroscopic crystals

Products:

• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
• FeCl₃ – Iron(III) chloride , Iron trichloride
  • Other names: Ferric chloride , Ferric chloride (anhydrous) , Iron(3+);trichloride ... show moreFerric;trichloride , [FeCl3] , FeCl3 , Iron chloride , Flores martis , Molysite show less
  • Appearance: Green-black by reflected light; purple-red by transmitted light; yellow solid as hexahydrate; brown as solution ; Black-to-brown hygroscopic crystals
• N₂O – Dinitrogen monoxide
  • Other names: Nitrous oxide , Laughing gas , Sweet air ... show moreProtoxide of nitrogen , Hyponitrous oxide , Hyponitrous acid anhydride , N2O , Nitrous , Nitro , NOS , Nitrious oxide , NNO , Diazyne 1-oxide , Factitious air , Nitrogen protoxide , E942 , R-744A , Hippie crack , Dinitrogen oxide show less
  • Appearance: Colourless gas ; Colourless compressed liquefied gas with characteristic odour ; Colorless gas with a slightly sweet odor. [inhalation anesthetic] [Note: Shipped as a liquefied compressed gas.]