Decomposition of Hydrogen Peroxide

2H2O2 → 2H2O + O2

Overview

Hydrogen peroxide spontaneously decomposes into water and oxygen gas. The reaction is dramatically accelerated by catalysts like manganese dioxide, potassium iodide, or the enzyme catalase found in blood and liver tissue. This is a classic demonstration reaction in chemistry education.

Participants

Role Substance Coefficient State
Reactant Hydrogen Peroxide H₂O₂ 2 (l)
Product Oxygen O 1 (g)
Product Water H₂O 2 (l)

Everyday Example

The fizzing when hydrogen peroxide is applied to a wound occurs because catalase in blood rapidly decomposes H2O2 into water and oxygen bubbles.

Industrial Importance

Understanding H2O2 decomposition is critical for safe storage and handling. Concentrated hydrogen peroxide can decompose explosively. The reaction is also used to generate oxygen in emergency breathing systems.

Properties

Type
Decomposition
Reversible
No
Energy
Exothermic
ΔH
-196.0 kJ/mol
Catalyst
Manganese dioxide (MnO₂) or catalase enzyme

Related Reactions

Cracking of Octane (Thermal Cracking) Decomposition of Ammonium Nitrate Decomposition of Barium Peroxide Decomposition of Calcium Carbonate (Calcination) Decomposition of Calcium Hypochlorite Decomposition of Carbonic Acid Decomposition of Iron(II,III) Oxide (Direct Reduction) Decomposition of Nitroglycerin Decomposition of Nitrous Oxide (Laughing Gas) Decomposition of Ozone

Frequently Asked Questions

What is the equation for Decomposition of Hydrogen Peroxide?
The balanced equation is: 2H₂O₂ → 2H₂O + O₂.
What type of reaction is Decomposition of Hydrogen Peroxide?
Decomposition of Hydrogen Peroxide is a decomposition reaction.
Is Decomposition of Hydrogen Peroxide exothermic or endothermic?
Decomposition of Hydrogen Peroxide is exothermic (releases energy). The enthalpy change (ΔH) is -196.0 kJ/mol.
What conditions are needed for Decomposition of Hydrogen Peroxide?
This reaction requires a catalyst (Manganese dioxide (MnO₂) or catalase enzyme).