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A Solution to Pollution 12/9/2010

A Solution to Pollution 12/9/2010. Acid Pollution and the Chicago River System. Objectives. Explore an acid pollution problem, and identify what needs to be known to solve it. Identify the pH of several standard household solutions

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A Solution to Pollution 12/9/2010

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  1. A Solution to Pollution12/9/2010 Acid Pollution and the Chicago River System

  2. Objectives • Explore an acid pollution problem, and identify what needs to be known to solve it. • Identify the pH of several standard household solutions • Describe the pH scale, and identify regions of the scale as acidic, basic, or neutral. • Predict what would need to be added to a solution to make it more acidic or basic.

  3. Chicago River, 1860

  4. Chicago River, Present Day

  5. River Chemistry • There are different ways to measure the health of a river. • pH is one quick and easy way to tell if the waters are too hostile for living systems. • Why might too high or too low a pH be dangerous for living things?

  6. Your Challenge • As scientists of the Environmental Protection Agency, you need to figure out what to do in a situation where a low pH might pose an environmental hazard.

  7. Chicago Sun Times: City Officials Meet with C-Chip • Read through the scenario in small groups • What words/ideas from the article do you want more information about? • What questions do you need answered before you make a decision about allowing C-Chip to dump wastes into the river?

  8. pH Ranges of Living Organisms in River Ecosystem Acidic Bacteria Plants (algae, rooted) Carp, catfish, some insects Bass, bluegill Snail, clams Largest variety of animals

  9. Name that pH! • See if you can identify the pH of these common household solutions! • Which is more acidic? • Which is more basic?

  10. What are acids/bases? Strong Acid: HCl (in water) Cl⁻+ H⁺ Strong Base: NaOH (in water) Na ⁺ + OH ⁻

  11. There is a difference of 10, in the change of H+ concentration (LOG)

  12. Demonstration • Write down what happens when an acidic or basic substance is placed in water… • When an acid or base is placed into water, the molecules separates into ions. • Strong Acid… HCL: H+ and Cl- • Strong Base… NaOH: Na+ and OH-

  13. pH= Power of Hydrogen ACID BASE Neutral: concentration of Hydrogen Ions= Hydroxide Ions

  14. Back to our Problem • Given a solution, how might you make it more acidic/basic/neutral? Acidic Waste Water Neutral Chicago River Water

  15. Homework • Complete Questions 1 and 2 on the C-Chip Challenge Hand-Out. • Bring back signed Field Trip and Consent Form

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