Summary: A puddle of glycerol is poured on a pile of potassium permanganate in a porcelain cup. After about 30seconds, the reaction bursts into purple flame.
Potassium permanganate is a strong oxidizer.
Chemicals and Solutions:
15 g potassium permanganate
2-3 mL glycerol
Place KMnO4 in dish
Add glycerol on top of potassium permanganate
Stand back. After 30 sec. the reaction mixture will burst into a purple flame
If larger crystals of potassium permanganate are used the reaction is much slower. (For this reason you can use this demonstration while teaching kinetics.)
This reaction can be delayed if the crystal size of the potassium permanganate is large.
14KMnO4 + 4C3H5(OH)3 ----> 7K2CO3 + 7Mn2O3 +5CO2 +16H2O