The dark liquid boils rapidly and when boiling stops it turns clear.
name: Oxidation reaction of isopropanol by permanganate ion proceeds with a great evolution of heat and solution color change.
Wear eye protection goggles and gloves. This is a violent reaction. Keep a safe distance. There is a serious fire risk - a fire extinguisher should be ready.
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In the considered experiment the oxidation reaction of isopropanol by permanganate ion is studied. Permanganate ions are a very intense purple color. If its concentration is high enough the solution looks dark. When potassium permanganate (KMnO4) is mixed together with sulfuric acid (H2SO4) and isopropanol (CH3CHOHCH3) a reaction begins.
2KMnO4 + 5CH3CHOHCH3 + 3H2SO4 → 2MnSO4 + 5CH3COCH3 + K2SO4 + 8H2O
The reaction is accompanied by evolution of a large amount of heat. The mixture boils rapidly. After the reaction is complete the solution turns clear since the products are colorless.