3 Na2S + 2 FeCl3 → 2 FeS + S + 6 NaCl – Balanced equation

This is an oxidation-reduction (redox) reaction:

Na₂S is a reducing agent, FeCl₃ is an oxidizing agent.

Reactants:

• Na₂S
  • Names: Sodium sulfide , Disodium sulfide , Sodium sulfide (anhydrous)
  • Appearance: Colorless, hygroscopic solid ; White-to-yellow hygroscopic crystals with characteristic odour
• FeCl₃ – Iron(III) chloride , Iron trichloride
  • Other names: {{ubl , Ferric chloride , Ferric chloride (anhydrous)
  • Appearance: Green-black by reflected light; purple-red by transmitted light; yellow solid as hexahydrate; brown as {{abbr|aq.|aqueous}} solution ; Black-to-brown hygroscopic crystals

Products:

• FeS
  • Names: Iron(II) sulfide , Iron sulfide , Ferrous sulfide
  • Appearance: Gray, sometimes in lumps or powder
• S
  • Names: Sulfur , S , Sulphur
  • Appearance: Yellow solid in various forms
• NaCl – Sodium chloride
  • Other names: {{unbulleted list , Salt , Table salt
  • Appearance: Colorless cubic crystals