H₂O + 16 HCl + 2 K₂Cr₂O₇ + 3 As₂O₃ → 4 KCl + 4 CrCl₃ + 6 H₃AsO₄

This is an oxidation-reduction (redox) reaction:

As₂O₃ is a reducing agent, K₂Cr₂O₇ is an oxidizing agent.

Reactants:

• 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
• 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.]
• K₂Cr₂O₇ – Potassium dichromate(VI)
  • Other names: Potassium dichromate , Chromium potassium oxide , Dipotassium dichromium heptaoxide ... show moreDipotassium dichromate , Dipotassium bichromate , Dichromic acid dipotassium salt , Dipotassium dichromate (VI) , Dichromic acid, dipotassium salt , Potassium bichromate show less
  • Appearance: Red-orange crystalline solid ; Orange-to-red crystals
• As₂O₃ – Diarsenic trioxide
  • Other names: Arsenic trioxide , Arsenic(III) oxide , Arsenic sesquioxide ... show moreArseneous oxide , Ratsbane , Arseneous anhydride , White arsenic , Aqua Tofani , Arsenious Trioxide , Arsentrioxide , Arseni Trioxydum , Arsenious Acid Anhydride , Arsenic Oxidearsenous Trioxide , Arsenious Acid , Anhydride Arsenieux , Arsenolite , Arsenous oxide , Diarsenic oxide , Arsenic oxide , Arsenous oxide anhydride , Acide Arsenieux , Arsenigen Saure , Arsenic Blanc , As₂O₃ , Arsenic(III)oxide , Arsenous acid anhydride show less
  • Appearance: White solid ; White lumps or crystalline powder

Products:

• 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
• CrCl₃ – Chromium(III) chloride , Chromium trichloride
  • Other names: Chromic chloride , Chromium(iii) chloride (anhydrous) , Chromium(3+) trichloride ... show moreCrCl3 , Anhydrous chromium(III) chloride , Chromium chloride , Puratronic chromium chloride , Trichlorochromium , Chromic chloride anhydrous show less
  • Appearance: Purple (anhydrous), dark green (hexahydrate) ; Violet crystals
• H₃AsO₄ – Arsenic acid, arsoric acid
  • Other names: Arsenic acid , Orthoarsenic acid , Desiccant L-10 ... show moreZotox , Arsenic acid (80% in water) , H3AsO4 , [AsO(OH)3] , Arsoric acid , Arsenic acid hemihydrate , Ortho-Arsenic acid solution show less
  • Appearance: White translucent crystals | hygroscopic. ; Colourless-to-pale-green-viscous liquid