2 As + 5 NaClO + 6 NaOH → 2 Na3AsO4 + 5 NaCl + 3 H2O

This is an oxidation-reduction (redox) reaction:

2 As0 - 10 e- → 2 AsV (oxidation)

5 ClI + 10 e- → 5 Cl-I (reduction)

As is a reducing agent, NaClO is an oxidizing agent.

Reactants:

  • As
    • Names: Arsenic source: ICSC, accessed: 2019-09-04, Grey arsenic source: ICSC, accessed: 2019-09-04
    • Appearance: Brittle grey metallic-looking crystals source: ICSC, accessed: 2019-09-04
  • NaClO – Sodium hypochlorite source: wikipedia, accessed: 2019-09-28
    • Other names: A source: wikipedia, accessed: 2019-09-28, Ntiformin|Bleach|Chloride of soda}}'In dilution:'C source: wikipedia, accessed: 2019-09-28, Arrel-Dakin solution|Modified Dakin's solution|Surgical chlorinated soda solution}} source: wikipedia, accessed: 2019-09-28
    • Appearance: Greenish-yellow solid (pentahydrate) source: wikipedia, accessed: 2019-09-28; Clear slightly yellow solution with characteristic odour source: ICSC, accessed: 2019-09-04; Clear slightly yellow solution with characteristic odour source: ICSC, accessed: 2019-09-04
  • NaOH
    • Names: Sodium hydroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Caustic soda source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Lye source: wikidata, accessed: 2019-09-02
    • Appearance: White, waxy, opaque crystals source: wikipedia, accessed: 2019-09-27; White hygroscopic solid in various forms source: ICSC, accessed: 2019-09-04; Colorless to white, odorless solid (flakes, beads, granular form). source: NIOSH NPG, accessed: 2019-09-02

Products:

  • Na3AsO4
  • NaCl – Sodium chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: {{unbulleted list source: wikipedia, accessed: 2019-09-27, Salt source: wikidata, accessed: 2019-09-02, Table salt source: wikidata, accessed: 2019-09-02
    • Appearance: Colorless cubic crystals source: wikipedia, accessed: 2019-09-27
  • 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