I2 + 2 NaOH → NaI + NaIO + H2O – Balanced equation

Or you want a quick look:

This is an oxidation-reduction (redox) reaction:

I - 1 e- II (oxidation)

I + e- I-I (reduction)

I2 is both an oxidizing and a reducing agent (disproportionation (dismutation)).

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  • I2
    • Names: Iodine , Jod , Iode
    • Appearance: Bluish black or dark purple crystals with pungent odour ; Violet solid with a sharp, characteristic odor.
  • NaOH
    • Names: Sodium hydroxide , Caustic soda , Lye
    • Appearance: White, waxy, opaque crystals ; White hygroscopic solid in various forms ; Colorless to white, odorless solid (flakes, beads, granular form).


  • 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
  • NaIO
  • H2OWater, 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
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