/ WHAT’S IN YOUR WATER?
Name: ______ /

Purpose: To apply solubility rules to determine what metals are present in a water sample from a contaminated river.

Question: How can solubility of compounds and chemical reactions be used to determine the chemicals present in a water sample?

Prelab: Complete part 1 on “What’s In Your Water Reactions” worksheet.

Day 1 Procedure:

Safety Precautions: Wear goggles & Silver Nitrate can stain your skin—wash your hands!!

1. Mix the solutions in a well plate as indicated in the table below.
2. Observe any and record what occurs. If a precipitate occurs, write the color of the precipitate along with “solid” in the box. If no precipitate occurs, write “no rxn” (no reaction).

Chemical / Silver nitrate / Lead (II) nitrate / Copper (II) sulfate / Potassium iodide / Sodium carbonate / Sodium chloride / Potassium chromate
Silver nitrate / 1 / 2 / 3 / 4 / 5 / 6
Lead (II) nitrate / 7 / 8 / 9 / 10 / 11
Copper (II) sulfate / 12 / 13 / 14 / 15
Potassium iodide / 16 / 17 / 18
Sodium carbonate / 19 / 20
Sodium chloride / 21
Potassium chromate

3. Complete parts 2-4 of the “What’s In Your Water Reactions” worksheet based on your reaction observations.

Procedure Day 2: Analyzing Water Samples from a Contaminated Water Supply

Severe metal pollution has occurred in the river system pictured on the right. The arrows indicate the direction of water flowing through the river system. Samples of water were taken in front of four paper mill companies as shown. Environmentalists suspect that heavy metals such as barium, copper, lead, and silver are now in the river because of companies along the river dumping waste.
Your task is to determine which of the four metals above, if any, are in the water samples.
A - NCR Corporation B - Appleton Papers C - Menasha Corporation D - Kimberly-Clark /
  1. Brainstorm with your group: What solutions gave positive tests in yesterday’s lab for each metal?
  1. Write a procedure and to determine the metal present in each location.
  2. Create a data table to record your observations.
  1. Once your teacher approves your procedure, you can obtain the water samples for testing.
  2. Conduct your procedure. Be sure to use the same safety guidelines as yesterday’s lab.

Post Lab:

Letter:

You are to write a report to the companies along the river with your findings. You must include the following information in your report. There must be 1 report written to each of the companies.

  1. Identify the metal in the sample and how you know using the observation data you collected.
  2. What are the health effects people in the area may experience if they ingest water with that metal?
  3. What types of treatment might the people have to undergo?
  4. How can the river be treated to remove the metal?

Global Impact:

Write a paragraph explaining the impact of water contamination in another country. Include the following information: Print the final copy & attach it to the back of this packet.

  1. What country?
  2. Where is that country located?
  3. What is the contaminant?
  4. What are the possible health effects if people ingest it?
  5. What treatments might they have to undergo?
  6. How can the water be treated to remove the contaminant?

Flint Michigan Article Summary: Answer each questions with 2-3 sentences.

  1. Explain how lead got into the drinking water supply.
  2. How did they determine the source of lead?
  3. What are the health effects for children due to lead in drinking water?
  4. What are the health effect for adults due to lead in drinking water?
  5. How does lead exposure in Flint compare to exposure in other places?
  6. Who do you think should be held responsible for cleaning up the water supply and why?

What’s in Your Water Lab Report

The following items need to be turned in by______in the order listed below:

Each person will turn in:

  1. Page one of the lab (Day 1 Data Table)
  2. What’s In Your Water Reactions with corrections
  3. Global Impact Paragraph
  4. Article Summary
  5. Letter to a company

As a group turn in:

Procedure Day 2 & Data Table Day 2

Criteria / Description for Mastery / Points Possible / Points Earned
Completed Lab / Participated in both days of lab activities / 37
Day 1 Data Table / Completely filled out, (solid, no rxn, color) every box has something written / 21
Molecular Equations / All formulas are correctly written and equation is correctly balanced / 21
Net Ionic Equations / All ions have correct charges, and all species have correct state of matter, and are correctly balanced / 21
Day 2 Procedure
(Turned in as a group) / Clearly written and uses correct scientific language, identified the specific chemical used to test for metals, used more than one chemical to test for each metal / 12
Day 2 Data Table
(Turned in as a group) / Neat, organized, completely filled out, correct identification of metals in water samples / 12
Letter / Correct format (same as the sample)(4), scientific language (4), & spelling, grammar & punctuation (4). / 12
Identification of metal (4) with explanation of how (4) you came to that conclusion using supporting (4) details from your data. / 12
Includes health effects / 4
Types of treatment people have to undergo / 4
Explain how to remove metal from the water / 4
Global Impact Paragraph / Identifies the country OUTSIDE USA & explain where it is located. / 8
Identifies the contaminant / 4
Identifies possible health effects / 4
Identifies treatments people must undergo / 4
Correct scientific language (4), spelling, grammar, and appropriate punctuation (4) / 8
Article Summary / Answers all questions with complete sentences. / 12
Teacher Comments / 200

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