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.