Mixture of Bleach and Sodium Metabisulfite

When bleach (typically a solution containing sodium hypochlorite, NaOCl) is mixed with sodium metabisulfite (Na2S2O5), a chemical reaction occurs. Sodium metabisulfite is a reducing agent and bleach is an oxidizing agent.

  • Bleach (sodium hypochlorite, NaOCl) acts as an oxidizer.
  • Sodium metabisulfite (Na2S2O5) acts as a reducer.

Chemical Reaction and Outcomes

The primary reaction produces sulfur dioxide gas (SO2) and salts such as sodium chloride (NaCl) and sodium sulfate (Na2SO4).

  • SO2 (sulfur dioxide) – a toxic and irritating gas
  • NaCl (sodium chloride)
  • Na2SO4 (sodium sulfate)

Safety Note

Warning: Mixing these chemicals releases sulfur dioxide gas, which is harmful to inhale and can cause respiratory distress. Such mixtures should not be performed outside of a laboratory environment with proper ventilation and personal protective equipment.

Summary

A mixture of bleach and sodium metabisulfite primarily results in the formation of sulfur dioxide gas and harmless salts, but it is dangerous due to the release of toxic fumes.