3 Na2SO3 (aq) + 2 NaIO3 (aq) + 2 NaHSO3 (aq) → 5 Na2SO4 (aq) + I2 (s) + H2O (l)

This is an oxidation-reduction (redox) reaction:

5 SIV - 10 e- → 5 SVI (oxidation)

2 IV + 10 e- → 2 I0 (reduction)

This is a precipitation reaction: I2 is the formed precipitate.

Reactants:

  • Na2SO3 – Sodium sulfite source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
    • Other names: Sodium sulphite source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Hypo clear (photography) source: wikipedia, accessed: 2019-09-28, E221 source: wikipedia, accessed: 2019-09-28
    • Appearance: White solid source: wikipedia, accessed: 2019-09-28; White crystals or powder source: ICSC, accessed: 2019-09-04
  • NaIO3
    • Names: Sodium iodate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Iodic acid source: wikipedia, accessed: 2019-09-27, Sodium salt source: wikipedia, accessed: 2019-09-27
    • Appearance: White orthorhombic crystals source: wikipedia, accessed: 2019-09-27
  • NaHSO3 – Sodium hydrogen sulfite source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Sodium bisulfite source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02, E222 source: wikipedia, accessed: 2019-09-27, Sodium bisulphite source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: White solid source: wikipedia, accessed: 2019-09-27; Colourless-to-yellow liquid with characteristic odour source: ICSC, accessed: 2019-09-04; White crystals or powder with a slight odor of sulfur dioxide. source: NIOSH NPG, accessed: 2019-09-02

Products:

  • Na2SO4
    • Names: Sodium sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Sodium sulphate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Sulfate of sodium source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid | hygroscopic source: wikipedia, accessed: 2019-09-27; White hygroscopic solid in various forms source: ICSC, accessed: 2019-09-04
  • I2
    • Names: Iodine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Jod source: ICSC, accessed: 2019-09-04, Iode source: ICSC, accessed: 2019-09-04
    • Appearance: Bluish black or dark purple crystals with pungent odour source: ICSC, accessed: 2019-09-04; Violet solid with a sharp, characteristic odor. source: NIOSH NPG, accessed: 2019-09-02
  • H2O – Water, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27