Oxidation of Glycerin by Potassium Permanganate
Oxidation of glycerin (1,2,3-propanetriol) by potassium permanganate is demonstrated. (This reaction is used to initiate the thermite demonstration that is shown separately.)
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Keywords
descriptive chemistry, enthalpy/heat, evidence of chemical reaction, exothermic process, organic - alcohols , redox reaction, strong oxidizing agent
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A few drops of glycerin are placed into a hollow in a pile of potassium permanganate. Potassium permanganate is a strong oxidizing agent and glycerin is an easily oxidized substance. Consequently a redox type reaction is expected between these two substances. An exothermic reaction does occur with the glycerin boiling giving off smoke and eventually producing a flame that spreads around the pile of potassium permanganate. Eventually all the glycerin is consumed by the permanganate.
 glycerin is placed on potassium permanganate. |
 The reaction is exothermic. |
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Discussion
Equation
14KMnO4 + 4C3H5(OH)3 --> 7K2CO3 + 7Mn2O3 + 5CO2 + 16H2O
Demonstration Notes, Warnings, Safety Information, etc.
Exam and Quiz Questions
1. Is this an endothermic or an exothermic reaction? Support your answer.
2. What observable evidence indicates that a chemical reaction is taking place?