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

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This is an oxidation-reduction (redox) reaction:

I - 1 e^- → I^I (oxidation)

I + e^- → I^-I (reduction)

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

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Reactants:

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).

Products:

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
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