Carbon Dioxide Race – Lap 2

This experiment is a variation on the first carbon dioxide race, where this time we watch the carbon dioxide extinguish the flames from the bottom of the tank to the top as a thicker layer builds up and spills over the beaker. Why does a layer build up from the bottom? Ask your students – they may remember from an earlier experiment


  • Beaker
  • Fish tank
  • Acetic acid (vinegar)
  • Baking soda (sodium bicarbonate)
  • Candles