2 Au + 4 CN- + O2 + 2 H2O → 2 [Au(CN)2] + 4 OH-

This is a complexation reaction: [Au(CN)2] is the formed complex.

This is an oxidation-reduction (redox) reaction:

2 Au0 - 4 e- → 2 AuII (oxidation)

2 O0 + 4 e- → 2 O-II (reduction)

Au is a reducing agent, O2 is an oxidizing agent.

Reactants:

  • 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
  • CN- – Cyanide source: wikipedia, accessed: 2019-09-27
    • Other names: Cyanide anion source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07, CN(-) source: wikidata, accessed: 2019-09-07, Carbon nitride ion source: wikidata, accessed: 2019-09-07
  • O2
    • Names: Dioxygen source: wikidata, accessed: 2019-09-07, Oxygen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, Oxygen (liquefied) source: ICSC, accessed: 2019-09-04
    • Appearance: Odourless compressed gas source: ICSC, accessed: 2019-09-04; Liquefied gas. colourless-to-blue extremely cold liquid source: ICSC, accessed: 2019-09-04
  • 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:

  • [Au(CN)2]
  • OH- – Hydroxide source: wikipedia, accessed: 2019-09-27
    • Other names: Hydroxide ion source: wikidata, accessed: 2019-09-07