5 HNO₂ + 2 KMnO₄ + HCl → 2 Mn(NO₃)₂ + KCl + KNO₃ + 3 H₂O

This is an oxidation-reduction (redox) reaction:

KMnO₄ is an oxidizing agent, HNO₂ is a reducing agent.

Reactants:

• HNO₂ – Nitrous acid , Hydroxidooxidonitrogen
  • Other names: HNO2 , [NO(OH)] , Nitrosyl hydroxide , Dioxonitric acid
  • Appearance: Pale blue solution
• KMnO₄ – Potassium manganate(VII)
  • Other names: Potassium permanganate , Chameleon mineral , Condy's crystals ... show morePermanganate of potash Hypermangan , Permanganic acid potassium salt show less
  • Appearance: Purplish-bronze-gray needles | magenta–rose in solution ; Dark purple crystals
• HCl – Chlorane , Hydrogen chloride
  • Other names: Hydrochloric acid , M , Uriatic acid ... show moreHydronium chloride , Chlorhydric Acid , Hydrochloric acid gas , HCl , Anhydrous 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.]

Products:

• Mn(NO₃)₂ – Manganese(II) nitrate
  • Other names: Manganese dinitrate , Manganese nitrate
  • Appearance: White powder
• KCl
  • Names: Potassium chloride , Sylvite , Muriate of potash ... show moreKlor-Con M15 , K-Lease , Klor-Con 8 , K+10 , K+8 , Klor-Con M10 , Micro-K 10 , Kato , Kaon Cl-10 , Kaon-Cl , Kaon Cl , Micro-K , Klor-Con 10Meq , Klor-Con 10 , Micro-K Ls , K-dur , Klor-Con , Klor-Con M20 , Slow-K , Ten-K , Klotrix , [KCl] , Kaliumchlorid , Chloride of potash , Kaon-CL 10 , Klor-CON , KCl , Monopotassium chloride , K-Tab , Chlorid draselny , Potassium Chloride show less
  • Appearance: White crystalline solid ; Colourless hygroscopic crystals
• KNO₃ – Potassium nitrate
  • Other names: Saltpeter , Saltpetre , Nitrate of potash ... show moreNitric acid, potassium salt , Niter , Salt peter , Nitre show less
  • Appearance: White solid ; Colourless-to-white crystalline powder
• 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