2 Na2S2O3 + I2 → Na2S4O6 + 2 NaI – Balanced equation

Or you want a quick look:

This is an oxidation-reduction (redox) reaction:

4 SII - 2 e- 4 S5/2 (oxidation)

2 I + 2 e- 2 I-I (reduction)

Na2S2O3 is a reducing agent, I2 is an oxidizing agent.

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Reactants:

  • Na2S2O3
    • Names: Sodium thiosulfate , Sodium hyposulfite , Hyposulphite of soda
    • Appearance: White crystals ; Colourless crystals
  • I2
    • Names: Iodine , Jod , Iode
    • Appearance: Bluish black or dark purple crystals with pungent odour ; Violet solid with a sharp, characteristic odor.

Products:

  • Na2S4O6
    • Names: Sodium tetrathionate
  • NaI
    • Names: Sodium iodide , Sodium iodide (anhydrous) , NaI , Sodium monoiodide
    • Appearance: White solid | deliquescent ; Colourless-to-white hygroscopic crystals or white powder. turns brown on exposure to air
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