Chemistry

SCH4C – Chemistry in the Environment Name:

2.05 - Water ContaminationCaseStudy 1/3

Water Contamination

1) Watch the following video https://www.youtube.com/watch?v=TiDwvwuDWKw 2) Use following tables to answer the questions.

Questions:

1. Why is it important that the maximum allowable concentration of contaminants in drinking water not be exceeded? [1]

2. A 10mL sample of drinking water was analyzed and found to contain 5.4 mg of nitrate ions. Is the water safe to drink? [3]

3. A sample of drinking water in a mining town in Northern Ontario has arsenic levels of 0.03 ppm. Is this water safe to drink? Explain. [2]

4. A) If a community’s drinking water contained the maximum acceptable levels of lead,

how much lead would a person in the community consume per year (assume a daily intake of 1.5 L) [2]

B) Would you be willing to drink this water? Give reasons for your decision. [2]

__ 10

SCH4C – Chemistry in the Environment Name:

2.05 - Water ContaminationCaseStudy 2/3

SCH4C – Chemistry in the Environment Name:

2.05 - Water ContaminationCaseStudy 3/3

WATER CONTAMINATION

* MAC = Maximum Allowable Concentration expressed in parts per million (ppm) or mg/L.