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Project title How does the acidity of lake water affect the hardness of Zebra mussel shells? Featured science projectScience project video
Difficulty Level Elementary school
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This science fair project was conducted to determine how the acidity of lake water affects the hardness of Zebra mussel shells. It would be interesting to know if the higher levels of acidity have the effect of softening or weakening the exoskeletons of aquatic invertebrates. s.This science fair project was done using Zebra mussels that were obtained from lakes with different levels of water acidity.  

Instructions preview
1. For this science fair project, the independent variable is the acidity of the lakes from which the Zebra mussels are harvested i.e. pH 6.5, pH7.0 and pH 7.5. The dependent variable is the hardness of the mussel shells. This is determined by using the manual hardness tester to check the hardness of the shell. The constants (control variables) are the age of the Zebra mussel, the amount of calcium in the water and the climate or temperature at the lakes. 2. The location of 3 lakes which contain Zebra mussels and are of different pH levels are selected. .....
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