This activity shows how water becomes more acidic when carbon dioxide is bubbled through it. Thus, it demonstrates the link between carbon dioxide in the atmosphere and a process called ocean acidification, a change in the pH, or acidity, of the ocean. This change in ocean chemistry has an impact on many living things in the oceans including coral polyps, clams, prawns, and other sea life.
(10 minutes preparation)
It is best to use water that has been boiled and then cooled. This lessens the amount of calcium carbonate in the water, which can slow the process of acidification.
If you want to see a more dramatic difference between two cups of water, try this method.
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