Objectives: Students will learn how to test tap water for the presence of iron, pH level of purity, copper, chlorine and hardness.
Unit proceeds for several weeks
(table available in print form)
1. pH - Prepare samples #1) baking soda #2) vinegar #3) aspirin. Fill a bag to line “C.” Close bag and shake each. Compare the color reaction to the color chart.
2. Chlorine - Prepare sample #1 - (5mL) of chlorine bleach with 3 teaspoons of water. Use 10 drops of this diluted bleach for sample #2. Fill a bag to line “C” with samples #1 and #2. Compare the 2 tests. Then test the tap water sample.
3. Iron - Prepare samples #1 and #2. Add one iron LR tablet to 3 teaspoons of distilled water and swirl to dissolve the coating. Use the uncoated tablet in 1 quart of distilled water. Mix for 30 seconds. Pour into an empty container. Measure 1/2 cup of sample #1. Pour into a clean, empty quart container with distilled water. Compare the two tests. Chart the results.
4. Copper - Fill a bag to line “C.” Add copper HR tablet. Close the bag and shake. Compare the reaction to the color chart. Record the copper concentration on the data sheet.
5. Hardness - Fill a bag to line “A” with tap water. Add “T” tablet; close the bag and shake. Compare the color with the color chart and record results on the data sheet. Add 1 drop of soap to each bag and shake. Keep adding soap until you get bubbles. Test your soap before doing the experiment.
1. pH - Have students tell why we test pH levels. Compare well water with city water etc. Define vocabulary. Study pipe diagram. Explain.
2. Chlorine - Students should determine why chlorine is added to city water. Why is too much, bad? Could different concentrations kill algae or visible bacteria? Do the scramble game.
3. Iron - Students analyze data sheet. Answer questions.
4. Copper - Students should be able to tell why copper can be harmful. Do the Word Search.
5. Hardness - Do the bubble test. Tell why the ring in the bathtub exists. Answer: Where else would you use more soap, if you had hard water? Do the bubblegram game.
Carbon Dioxide (CO )