Gas bubbles will appear. Light the candle and prepare to test the gas with a wooden splint or a toothpick. The splint should be burning to test for carbon dioxide. Insert the burning splint into the neck of the jar or flask. Use the candle to relight the splint and test the gas again.
Extensions Write the equation for the reaction occurring in the above experiment.
H2O Carbon dioxide does not support combustion. Oxygen is the substance that is necessary for any burning to take place. The splint should be extinguished. Carbon dioxide is 1.5 times heavier than air. Fire extinguishers use to CO2 to eliminate the oxygen needed by fire.