6 H2SeO4 + 2 Au Au2(SeO4)3 + 3 SeO2 + 6 H2O

This is an oxidation-reduction (redox) reaction:

3 SeVI + 6 e- 3 SeIV (reduction)

2 Au0 - 6 e- 2 AuIII (oxidation)

H2SeO4 is an oxidizing agent, Au is a reducing agent.

Reactants:

  • H2SeO4Selenic(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
  • Au
    • Names: Gold source: wikidata, accessed: 2019-09-07, Au source: wikidata, accessed: 2019-09-07, Element 79 source: wikidata, accessed: 2019-09-07, Aurum source: wikidata, accessed: 2019-09-07

Products:

  • Au2(SeO4)3
    • Names: Gold(III) selenate source: wikidata, accessed: 2019-09-03, Gold selenate source: wikidata, accessed: 2019-09-03
  • SeO2
    • Names: Selenium dioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Selenium(IV) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Selenous anhydride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Appearance: White crystals, turn slightly pink with trace decomposition source: wikipedia, accessed: 2019-09-27; Lustrous white hygroscopic crystals or powder. its yellowish green vapour has a pungent sour smell source: ICSC, accessed: 2019-09-04
  • H2OWater, 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