THE COLOURS OF CARBON DIOXIDE
Laia Pellejà, Fernando Gomollón-Bel, Catalan Institute of Chemical Research (ICIQ)
Laia Pellejà, Fernando Gomollón-Bel, Catalan Institute of Chemical Research (ICIQ)
The amount of carbon dioxide in the atmosphere has increased exponentially. CO2 is one of the main causes of climate change. For example, CO2 can be blamed for acidifying oceans, because when it dissolves in water it becomes carbonic acid (like in soft drinks).
1.
BOIL a leaf of cabbage in water for 10 minutes to prepare the pH indicator (if you are using a universal indicator, skip this step).
2.
POUR about 100m of water into the glass and add some drops of the indicator.
3.
BLOW through the reeds into the glass and observe.
4.
TAKE several samples and observe how large quantities of CO2 acidify the water more.
5.
The indicators take on an orange or red colour. You can compare the amounts of CO2 with other daily emissions (cars, factories, etc.).
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