5 H2S (g) + 2 HIO3 (aq) I2 (s) + 5 S (s) + 6 H2O (l)

This is an oxidation-reduction (redox) reaction:

5 S-II - 10 e- 5 S0 (oxidation)

2 IV + 10 e- 2 I0 (reduction)

H2S is a reducing agent, HIO3 is an oxidizing agent.

Reactants:

  • H2SHydrogen sulfide source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: ICSC, accessed on: 2019-09-04source: NIOSH NPG, accessed on: 2019-09-02
    • Other names: Dihydrogen monosulfide source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Dihydrogen sulfide source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Sewer gas source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02source: NIOSH NPG, accessed on: 2019-09-02
    • Appearance: Colorless gas source: wikipedia, accessed on: 2019-09-27; Colourless compressed liquefied gas with characteristic odour of rotten eggs source: ICSC, accessed on: 2019-09-04; Colorless gas with a strong odor of rotten eggs. [Note: Sense of smell becomes rapidly fatigued & can NOT be relied upon to warn of the continuous presence of H2S. Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed on: 2019-09-02
  • HIO3
    • Names: Iodic acid source: wikipedia, accessed on: 2019-09-27source: wikidata, accessed on: 2019-09-02, Iodic(V) acid source: wikipedia, accessed on: 2019-09-27, [IO2(OH)] source: wikidata, accessed on: 2019-09-02
    • Appearance: White solid source: wikipedia, accessed on: 2019-09-27

Products:

  • 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
  • S
    • Names: Sulfur source: wikidata, accessed on: 2019-09-07source: ICSC, accessed on: 2019-09-04, S source: wikidata, accessed on: 2019-09-07, Sulphur source: wikidata, accessed on: 2019-09-07source: ICSC, accessed on: 2019-09-04
    • Appearance: Yellow solid in various forms source: ICSC, accessed on: 2019-09-04
  • 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