Thermal Decomposition of Potassium Permanganate

2KMnO4 → K2MnO4 + MnO2 + O2

Overview

Potassium permanganate, a deep purple crystalline solid, decomposes when heated above 240 C to form potassium manganate, manganese dioxide, and oxygen gas. This is one of the most visually striking decomposition reactions, as the purple solid transforms to green and brown products while releasing gas.

Participants

Role Substance Coefficient State
Product Oxygen O 1 (g)

Everyday Example

Potassium permanganate solution is used as an antiseptic wound wash and water purification agent in camping and survival situations.

Industrial Importance

Used in water treatment for taste and odor control, in analytical chemistry as an oxidant, and in organic synthesis. Understanding its decomposition is important for safe storage.

Properties

Type
Decomposition
Reversible
No
Energy
Endothermic
ΔH
171.0 kJ/mol

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 Hydrogen Peroxide Decomposition of Iron(II,III) Oxide (Direct Reduction) Decomposition of Nitroglycerin Decomposition of Nitrous Oxide (Laughing Gas)

Frequently Asked Questions

What is the equation for Thermal Decomposition of Potassium Permanganate?
The balanced equation is: 2KMnO₄ → K₂MnO₄ + MnO₂ + O₂.
What type of reaction is Thermal Decomposition of Potassium Permanganate?
Thermal Decomposition of Potassium Permanganate is a decomposition reaction.
Is Thermal Decomposition of Potassium Permanganate exothermic or endothermic?
Thermal Decomposition of Potassium Permanganate is endothermic (absorbs energy). The enthalpy change (ΔH) is 171.0 kJ/mol.