a solution to pollution 12/9/2010
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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 - PowerPoint PPT PresentationTRANSCRIPT
A Solution to Pollution
12/9/2010Acid Pollution and the Chicago River
System
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.
Objectives
Chicago River, 1860
Chicago River, Present Day
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?
River Chemistry
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.
Your Challenge
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?
Chicago Sun Times: City Officials Meet with C-Chip
Bacteria
Plants (algae, rooted)
Carp, catfish, some insects
Bass, bluegill
Snail, clams
Largest variety of animals
pH Ranges of Living Organisms in River EcosystemAcidic
See if you can identify the pH of these common household solutions!
Which is more acidic? Which is more basic?
Name that pH!
What are acids/bases?
Strong Acid: HCl (in water) Cl⁻+ H⁺Strong Base: NaOH (in water) Na ⁺ + OH ⁻
There is a difference of 10, in the change of H+ concentration (LOG)
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-
Demonstration
pH= Power of HydrogenACID BA
SE
Neutral:concentration of Hydrogen Ions= Hydroxide Ions
Given a solution, how might you make it more acidic/basic/neutral?
Back to our Problem
Acidic Waste Water
Neutral Chicago River Water
Complete Questions 1 and 2 on the C-Chip Challenge Hand-Out.
Bring back signed Field Trip and Consent Form
Homework