Do Now for 2/27/13Take out C40 report

HW: Review procedures for C41

C41 Testing Water QualityToday’s Target: I will be able to design a

quality data table to use to record my data.

Wrap up and Check C40Introduce C41Review procedureDesign data table

C40 Parts per Million5. 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.

C40 Parts per Million6. 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.

C40 Parts per Million7. 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.

C40 Parts per Million8. 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.

C40 Parts per Million – Key Points1. 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.

C40 Report CheckWrite up – 5 pointsData – 5 pointsAnalysis questions – 5 pointsKey Points – 5 PointsAdditional worksheet 40.1 = 5 pointsTotal = 25 points

C41 Testing Water QualityWillow 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 activityTest 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.

C41 Testing Water QualityWe will be using indicators to test for the

presence of contaminants in the water.Background and Challenge on page C-57Write up

TitleChallengeSafety

C41 Testing Water QualityHow 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

C41 Testing Water QualityIf 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.

C41 Testing Water QualityReview the procedure on pages C-58

through 61Design 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.

Do Now for 2/28/13Take out C41 materialsHW: None

C41 Testing Water QualityToday’s Target: I will be able to gather

data about the water quality of 3 water samples.

Review tests and lab tipsLab safetyGather dataClean up

C41 Testing Water QualityLab tips

Place trays on a white backgroundDon’t forget to gather data for distilled

water as well.Wash and dry stir stick after each use – DO

NOT BREAK ITMAKE SURE YOU HAVE THE DATA

RECORDED BEFORE YOU LEAVE TODAY!

C41 Testing Water QualityGoggles and apronsWash and dry all equipment when done.Wash and dry your trayOrganize all equipment on trayWash handsDO NOT TAKE OFF SAFETY EQUIPMENT

UNTIL YOU ARE READY TO WASH YOUR HANDS!!

Do Now for 3/1/13Take out C41 materialsHW: Complete reportHand in any missing work

C41 Testing Water QualityReview dataIntroduce reportExampleComplete report for tomorrow

C41 Testing Water QualityWater sample

Appearance/turbidity

Odor pH (color)

Iron (color)

Nitrate (color)

Copper

Fenton River

Clear/Colorless

None Red Clear Light purple/beige

Clear

Well Water

Clear/Colorless

None Yellow/green

Clear Bright Purple

Clear

Willow Lake

Slightly cloudy

None Yellow/green

Clear Light purple/beige

Clear

Distilled Water

Clear/Colorless

None Yellow/green

Clear Light purple/beige

Clear

C41 Testing Water QualityWe 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.

Do Now for 5/24/12Take out C41 reportHW: None

C41 Testing Water QualityCollect C41 report

C41 Testing Water Quality1. 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.