Na2SO3 + I2 + H2O Na2SO4 + 2 HI

This is an oxidation-reduction (redox) reaction:

SIV - 2 e- SVI (oxidation)

2 I0 + 2 e- 2 I-I (reduction)

Na2SO3 is a reducing agent, I2 is an oxidizing agent.

Reactants:

  • Na2SO3Sodium sulfite source: wikipedia, accessed on: 2019-09-28source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04
    • Other names: Sodium sulphite source: wikipedia, accessed on: 2019-09-28source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04, Hypo clear (photography) source: wikipedia, accessed on: 2019-09-28, E221 source: wikipedia, accessed on: 2019-09-28
    • Appearance: White solid source: wikipedia, accessed on: 2019-09-28; White crystals or powder source: ICSC, accessed on: 2019-09-04
  • I2
    • Names: Iodine source: ICSC, accessed on: 2019-09-04source: NIOSH NPG, accessed on: 2019-09-02, Jod source: ICSC, accessed on: 2019-09-04, Iode source: ICSC, accessed on: 2019-09-04
    • Appearance: Bluish black or dark purple crystals with pungent odour source: ICSC, accessed on: 2019-09-04; Violet solid with a sharp, characteristic odor. source: NIOSH NPG, accessed on: 2019-09-02
  • H2OWater, oxidane source: wikipedia, accessed on: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed on: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed on: 2019-09-27, Hydrogen oxide source: wikipedia, accessed on: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed on: 2019-09-27

Products:

  • Na2SO4
    • Names: Sodium sulfate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04, Sodium sulphate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Sulfate of sodium source: wikipedia, accessed on: 2019-09-27
    • Appearance: White crystalline solid | hygroscopic source: wikipedia, accessed on: 2019-09-27; White hygroscopic solid in various forms source: ICSC, accessed on: 2019-09-04
  • HIIodane source: wikipedia, accessed on: 2019-09-27
    • Other names: Hydroiodic acid source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Hydrogen iodide source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04, Hydronium iodide source: wikipedia, accessed on: 2019-09-27
    • Appearance: Colorless liquid source: wikipedia, accessed on: 2019-09-27; Colorless gas source: wikipedia, accessed on: 2019-09-27; Colourless compressed liquefied gas with pungent odour source: ICSC, accessed on: 2019-09-04