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Photosynthesis Science Fair Project

The Acidification of Oceans

The Acidification of Oceans | Science Fair Projects | STEM Projects
Have you ever wondered how the acidity of our oceans is affected by aquatic plants? In this experiment, you will observe how the number of aquatic plants affects the acidity of the water.


The hypothesis is that increasing the amount of aquatic plants in the aquarium will reduce the acidity and increase the pH level of the water.

Method & Materials

You will fill three fish tanks with one liter of water each, add five guppies to each tank, and then add two or four aquatic seaweed plants to two of the tanks. You will measure the pH level of the water in the tanks every hour and record your results.
You will need 15 guppy fishes, 3 fish tanks which can hold 1 liter of water each, 3 liters of water, 6 aquatic seaweed plants, 1 fish net to transfer the fish, pH paper, and 1 clock to record time.


The results show that the acidity in the water will increase if there are only fishes and no aquatic plant. Increasing the number of aquatic plants help to reduce the acidity of the water. This process ultimately helps to keep in check the acidification of our oceans, caused by human activities.

Why do this project?

This science project is interesting and unique because it shows how the number of aquatic plants can help reduce the acidity of our oceans.

Also Consider

Consider repeating the experiment without the fish. Try to add some corals into the water. Try to perform this experiment at night in the dark when the aquatic plants cannot perform photosynthesis. How does this affect the carbon dioxide content in the water?

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

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