X864: Self Lighting Candles
Introduction
Isopropyl alcohol is added to dark green crystals in a crucible or on a candle. Flames are produced, igniting the candle wick.
Equations
2CrO3 + 3(CH3)2CHOH 3(CH3)2CO + Cr2O3 + 3H2O
Isopropyl alcohol is oxidized to acetone by the chromium trioxide. Heat given off by the reaction ignites the acetone.
To Conduct Demonstration
- Drop isopropyl alcohol (from a height of about 18") into a crucible containing about a gram of CrO3 or onto a candle with CrO3 crystals next to its wick.
Safety and Disposal
Keep the dropper bottle of alcohol a safe distance from any flames. Perform on a heat-proof surface. Chromium compounds are carcinogenic and should be handled with care.