Do Now for 2/27/13

1. Do Now for 2/27/13 Take out C40 report HW: Review procedures for C41

2. C41 Testing Water Quality • Today’s Target: I will be able to design a quality data table to use to record my data. • Wrap up and Check C40 • Introduce C41 • Review procedure • Design data table

3. C40 Parts per Million • 5. Do you think there is any food coloring in cup 8 even though it appears colorless? • Yes. Even if we dilute something, it is still there. We took some of the liquid from cup 7 and moved it into cup 8, and cup 7 had food coloring in it.

4. C40 Parts per Million • 6. Explain how you could do an experiment to provide evidence to support your answer for question 5. • Use a microscope to look for food coloring particles in cup 8, or let the water evaporate and see if any food coloring particles are left over.

5. C40 Parts per Million • 7. Describe something a scientist might study and report using parts per million as a measurement tool. • Useful for studying and measuring small amounts of pollutants in air or water.

6. C40 Parts per Million • 8. Assume someone told you that if your water looks clear and does not smell bad, it is safe to drink. Would you follow this advice? Why or why not? • It is possible for some contaminant to be present in clear, odorless water, even though we cannot see it or smell it, because in this investigation we know there was some of the red substance in the drop we used to make the solution that became colorless.

7. C40 Parts per Million – Key Points • 1. The concentration of a solution is expressed in terms of parts of solute to parts of solvent. • 2. The term parts per million is a way to express concentration. • 3. Mathematical relationships (orders of magnitude and proportion) are involved in serial dilution and the expression of concentration of a solution.

8. C40 Report Check • Write up – 5 points • Data – 5 points • Analysis questions – 5 points • Key Points – 5 Points • Additional worksheet 40.1 = 5 points • Total = 25 points

9. C41 Testing Water Quality • Willow Grove Review • We will test three (3) samples of water to determine is there are any contaminants we should be worried about. • This is an assessment activity • Test your ability to organize and analyze data from this investigation. • Apply what you’ve learned about water to write a report about the safety of the water in Willow Grove.

10. C41 Testing Water Quality • We will be using indicators to test for the presence of contaminants in the water. • Background and Challenge on page C-57 • Write up • Title • Challenge • Safety

11. C41 Testing Water Quality • How much risk from the water you drink at home would you consider acceptable? • Federal Government sets drinking water standards (Clean Water Act) – Page C-59 • States help to enforce these standards

12. C41 Testing Water Quality • If you were in charge of water treatment for a town, what would be your primary goals for the water treatment? • Three goals of water treatment: • Sanitation • Killing of harmful organisms – usually through chlorination • Minimization and removal of potentially harmful substances (heavy metals) • Through various chemical procedures • Providing water that looks, smells, and tastes good • We will consider the appearance, and smell of the water only.

13. C41 Testing Water Quality • Review the procedure on pages C-58 through 61 • Design a table to record your data • Hints • Consider the Federal Water Quality Standards on page C-59 when designing your table. • You need a title for your table • Make sure you have clear headings for each column • Leave enough space to record data in your table. • I must give approval to your table before you leave class.

14. Do Now for 2/28/13 • Take out C41 materials • HW: None

15. C41 Testing Water Quality • Today’s Target: I will be able to gather data about the water quality of 3 water samples. • Review tests and lab tips • Lab safety • Gather data • Clean up

16. C41 Testing Water Quality • Lab tips • Place trays on a white background • Don’t forget to gather data for distilled water as well. • Wash and dry stir stick after each use – DO NOT BREAK IT • MAKE SURE YOU HAVE THE DATA RECORDED BEFORE YOU LEAVE TODAY!

17. C41 Testing Water Quality • Goggles and aprons • Wash and dry all equipment when done. • Wash and dry your tray • Organize all equipment on tray • Wash hands • DO NOT TAKE OFF SAFETY EQUIPMENT UNTIL YOU ARE READY TO WASH YOUR HANDS!!

18. Do Now for 3/1/13 • Take out C41 materials • HW: Complete report • Hand in any missing work

19. C41 Testing Water Quality • Review data • Introduce report • Example • Complete report for tomorrow

20. C41 Testing Water Quality

21. C41 Testing Water Quality • We need to develop a lab report to present to the town. • Sample answer: The Fenton River water had a low pH because the indicator turned orange, but did not contain iron, copper, or nitrate. The low pH could have been caused by industrial waste or fertilizer that washed into the river. It did not appear turbid.

22. Do Now for 5/24/12 • Take out C41 report • HW: None

23. C41 Testing Water Quality • Collect C41 report

24. C41 Testing Water Quality • 1. Indicator: A substance that can be used to demonstrate whether or not another substance is present. For example, pH paper and universal indicator are acid-base indicators that change color with a change in the pH of a solution. • 2. pH: A way of describing the acidic or basic strength of a solution. The pH value of a solution is a number on a scale from 0 to 14. A pH value of 0–1 indicates a strong acid. A pH value of 12–14 indicates a strong base. A pH value of 7 indicates a neutral solution. • 3. Turbidity: The cloudiness of a liquid caused by very small particles that are suspended in the liquid.