This is a decomposition reaction.
- Hydrogen peroxide –> (Manganese oxide [insoluble catalyst]) Water + Oxygen
- 2H2O2 –> 2H2O + O2
Hydrogen peroxide (2H2O2) decomposes slowly to form water and oxygen. However, this process is sped up by a catalyst – Manganese oxide (MnO2). Do not get Manganese mixed up with Magnesium! This process is very efficient because Oxygen is not very soluble in water – therefore little water is lost