Ag2SeO3 + Br2 + H2O → H2SeO4 + 2 AgBr

This is an oxidation-reduction (redox) reaction:

2 Br0 + 2 e- → 2 Br-I (reduction)

SeIV - 2 e- → SeVI (oxidation)

Br2 is an oxidizing agent, Ag2SeO3 is a reducing agent.

Reactants:

  • Ag2SeO3
    • Names: Silver selenite source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02, Silver(I) selenite source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02
    • Appearance: Crystalline needles source: wikipedia, accessed: 2019-09-28
  • Br2
    • Names: Bromine source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Molecular bromine source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Fuming red-to-brown liquid with pungent odour source: ICSC, accessed: 2019-09-04; Dark reddish-brown, fuming liquid with suffocating, irritating fumes. 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

Products:

  • H2SeO4 – Selenic(VI) acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Selenic acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, H2SeO4 source: wikidata, accessed: 2019-09-02, [SeO2(OH)2] source: wikidata, accessed: 2019-09-02
    • Appearance: Colorless deliquescent crystals source: wikipedia, accessed: 2019-09-27
  • AgBr
    • Names: Silver bromide source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02, Bromargyrite source: wikipedia, accessed: 2019-09-28, Bromyrite source: wikipedia, accessed: 2019-09-28
    • Appearance: Pale yellow solid | photosensitive source: wikipedia, accessed: 2019-09-28