2.18 describe the laboratory preparation of oxygen from hydrogen peroxide, using manganese(IV) oxide as a catalyst

This is a decomposition reaction.

Equations –

  • 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




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