2 KMnO₄ + 5 AsCl₃ + 16 HCl → 5 AsCl₅ + 2 MnCl₂ + 2 KCl + 8 H₂O

This is an oxidation-reduction (redox) reaction:

KMnO₄ is an oxidizing agent, AsCl₃ is a reducing agent.

Reactants:

• 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
• AsCl₃
  • Names: Arsenic trichloride , Arsenic(III) chloride , Arsenous trichloride ... show moreButter of arsenic , De Valagin's solution , AsCl3 , Arsenic butter , Arsenic chloride , Trichloroarsine , Caustic oil of arsenic , Arsenic(III) trichloride , Caustic arsenic chloride , Arsenious chloride , Arsenic III chloride , Arsenous chloride show less
  • Appearance: Colourless liquid ; Colourless oily fuming liquid with pungent odour
• 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:

• AsCl₅
  • Names: Arsenic pentachloride
• MnCl₂ – Manganese(II) chloride , Manganese dichloride
  • Other names: Manganous chloride , Manganous dichloride , Manganese(II) chloride (1:2) ... show moreManganese bichloride , Manganese chloride anhydrous , Manganese chloride , Manganese(II) dichloride show less
  • Appearance: Pink solid (tetrahydrate)
• 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
• 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