MYP 7.4.5: Carbon dioxide in the air
Carbon dioxide in the air, the carbon cycle, photosynthesis, respiration, combustion, fossil fuels.
Possible approach burning candles to show CO2
Exhaled air through limewater to show CO2
Make carbon dioxide generators out of side-arm tubes, marble chips and hydrochloric acid and rubber tubing.
Pass the carbon dioxide through a solution of calcium hydroxide (limewater)
Collect some CO2 and test it with a lighted splint
Collect some CO2 and test it with damp universal indicator paper.
Collect a gas jar of carbon dioxide and pour it onto a lit candle in a beaker. This demonstrates that carbon dioxide is a dense gas.
Environmental Science: The Carbon and Oxygen Cycles p50-1
Two solutions are prepared separately:
Solution A: 0.02 g of thymol blue, 0.01 g cresol red and 2 mL of ethanol
Solution B: 0.8 g of sodium bicarbonate, 7.48 g of potassium chloride and 90 mL of water
A working solution is prepared by mixing 9 mL of A + 1 mL of B in 1000 mL of distilled water.
Copyright: 2003 Isis Publication