The Marathon Battery Story (Page 2 of 2) in pdf

1. Which well has one part per million of food coloring in the liquid? _________________

2. Which well has 10 ppm? _________________

3. Which well has 100 ppm? _________________

4. Explain the meaning of one part per million.

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5. The surface sediments in part of Foundry Cove were contaminated with 50,000 ppm of cadmium in 1975.

Explain what this means.

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Extension:

a. Write the ppm food coloring for each of the seven wells.

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b. How many more test tubes would you need to continue the dilutions to get 1 ppb (part per billion)? Explain

how you know.

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c. How could you make 50,000 ppm food coloring? (50,000 ppm was the highest contamination shown on the

maps in Lesson 1.) Describe the steps.

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Student Worksheet

Marathon Battery: Serial Dilutions

The Marathon Battery Story Page 2