K2MnO4 + 8 HCl → MnCl2 + 2 KCl + 2 Cl2 + 4 H2O – Balanced equation

This is an oxidation-reduction (redox) reaction:

K₂MnO₄ is an oxidizing agent, HCl is a reducing agent.

Reactants:

• K₂MnO₄ – Potassium manganate(VI)
  • Other names: Potassium manganate
  • Appearance: Green crystals (darkening with time)
• HCl – Chlorane , Hydrogen chloride
  • Other names: Hydrochloric acid , M , Uriatic acid
  • 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:

• MnCl₂ – Manganese(II) chloride , Manganese dichloride
  • Other names: Manganous chloride , Manganous dichloride , Manganese(II) chloride (1:2)
  • Appearance: Pink solid (tetrahydrate)
• KCl
  • Names: Potassium chloride , Sylvite , Muriate of potash
  • Appearance: White crystalline solid ; Colourless hygroscopic crystals
• Cl₂
  • Names: Chlorine , Molecular chlorine
  • Appearance: Greenish-yellow compressed liquefied gas with pungent odour ; Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas