NaIO3 (aq) + 5 NaI (aq) + 3 H2SO4 (aq) 3 Na2SO4 (aq) + 3 I2 (s) + 3 H2O (l)

This is an oxidation-reduction (redox) reaction:

5 I-I - 5 e- 5 I0 (oxidation)

IV + 5 e- I0 (reduction)

NaI is a reducing agent, NaIO3 is an oxidizing agent (synproportionation).

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

Reactants:

  • NaIO3
    • Names: Sodium iodate source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Iodic acid source: wikipedia, accessed on: 2019-09-27, Sodium salt source: wikipedia, accessed on: 2019-09-27
    • Appearance: White orthorhombic crystals source: wikipedia, accessed on: 2019-09-27
  • NaI
    • Names: Sodium iodide source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Sodium iodide (anhydrous) source: ICSC, accessed on: 2019-09-04, NaI source: wikidata, accessed on: 2019-09-02, Sodium monoiodide source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04
    • Appearance: White solid | deliquescent source: wikipedia, accessed on: 2019-09-27; Colourless-to-white hygroscopic crystals or white powder. turns brown on exposure to air source: ICSC, accessed on: 2019-09-04
  • H2SO4Sulfuric acid source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-07source: NIOSH NPG, accessed on: 2019-09-02
    • Other names: Oil of vitriol source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-07source: ICSC, accessed on: 2019-09-04source: NIOSH NPG, accessed on: 2019-09-02, Sulfuric acid, concentrated (> 51% and < 100%) source: ICSC, accessed on: 2019-09-04, H2SO4 source: wikidata, accessed on: 2019-09-07
    • Appearance: Clear, colorless liquid source: wikipedia, accessed on: 2019-09-27; Odourless colourless oily hygroscopic liquid source: ICSC, accessed on: 2019-09-04; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.] source: NIOSH NPG, accessed on: 2019-09-02

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
  • 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