5 HClO₄ + 4 H₂O + 4 Br₂ → 5 HCl + 8 HBrO₃

This is an oxidation-reduction (redox) reaction:

Br₂ is a reducing agent, HClO₄ is an oxidizing agent.

Reactants:

• HClO₄ – Chloric(VII) acid
  • Other names: Perchloric acid , Hyperchloric acid , Perchloric acid (72% solution) , Hydronium perchlorate
  • Appearance: Colorless liquid ; Colourless liquid with pungent odour
• 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
• Br₂
  • Names: Bromine , Molecular bromine
  • Appearance: Fuming red-to-brown liquid with pungent odour ; Dark reddish-brown, fuming liquid with suffocating, irritating fumes.

Products:

• 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.]
• HBrO₃ – Bromic acid
  • Other names: Bromic(V) acid