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Measuring pH Levels

SCI103 Unit 2 Lab Tutorial: http://youtu.be/oeTy0zN3xTg?hd=1

Instructions: Enter the Virtual Lab, and conduct the experiments provided before going out into the virtual field for additional research. Please type your answers on this form. When your lab report is complete, submit it to the Submitted Assignments area of the Virtual Classroom.

General Resource Video: https://www.youtube.com/watch?v=ANi709MYnWg

Part I: Answer the following questions while in the Unit 1 lab environment.

For section 1 and 2:
• To test pH of solutions and lakes: Enter the Lab through the third item in the Unit’s MUSE.
• The MUSE can be accessed by clicking on Learning Materials (Unit 2).

Section 1: You will be testing 4 known solutions for pH levels using a standard wide-range indicator. Based off of the results obtained in the lab room, fill in the following table:

Solution Number pH from Lab Acid, Base or Neutral? Solution Name (what was in the test tube?)
Solution 1
Solution 2
Solution 3
Solution 4

Section 2: Now that you understand how to read pH measurements, go out into the field to gather pH samples from 3 different lakes to take back to the lab for testing, and answer the following questions:

  1. What was the pH level measured at Lake 1?
  2. What was the pH level measured at Lake 2?
  3. What was the pH level measured at Lake 3?
  4. Which two lakes have the highest levels of acidity in their water?

Part II: For the following questions, provide your response in short-answer format (3–5 detailed sentences each). Use the links provided along with this Unit’s activities and resources to prepare your answers.

Look for at least three acids and at least three bases around your home.

For question 5 and 6:

• Use this link as a guide: http://www.ehow.com/list_6930749_acids-bases-found-homes.html
• Watch instructional video (in Unit 2 IP assignment description)
• Review Unit 2 learning materials- In MUSE – first item

  1. List and describe the acids you found. What things do the acids have in common?

Three examples of acids are that I found in my home are
a. ____
b. ___________
c. ___

Description (Describe using complete sentences. Some suggestions- what do they contain, what they are used for and why, what are their properties, what is their pH.

a)
b)
c)

Some common attributes of acids:

  1. List and describe the bases you found. What things do these have in common? Three examples of bases are that I found in my home are a. ____
    b. ___________
    c. ___

Description (Describe using complete sentences. Some suggestions- what do the bases contain, what they are used for, what are their properties, what is their pH.

a)
b)
c)

Some common attributes of bases:

  1. Look at your data for the three lakes in the virtual lab. Acid rain is impacting two of these three lakes. Explain what acid rain is and describe which two lakes are receiving acid rain. Also, discuss how the location of each lake relates to their pH level.

• What is Acid rain?

        Read the following lessons, view the instructional video explain acid rain in 
        3- 5 sentences.

o Watch instructional video (in Unit 2 IP assignment description)
o Unit 2 Intellipath materials – Lesson: Acid Rain Causes and Effects and
o Unit 2 learning materials (in MUSE): first item- pH and Acid Rain

• Describe which two lakes are receiving acid rain.

• Discuss how the location of each lake (Lake 1, Lake 2 and Lake 3) relates to their pH level. (While explaining location and how it impacts pH levels and causes varying impacts of Acid Rain use data from part 1 is used to discuss how each lake’s location)

  1. Imagine a lake receives acid rain for an extended period of time. The original pH of the lake was 6, but it has now dropped to pH 3. How many times more acidic has this lake become? What negative impacts can this amount of acidification have on the environment? Watch this video: https://www.youtube.com/watch?v=Nf8cuvl62Vc
    Watch instructional video (in assignment description) and
    Read Unit 2 learning materials (in MUSE) – first item- pH and Acid Rain

• The original pH of the lake was 6, but it has now dropped to pH 3. How many times more acidic has this lake become?

• Explain negative impacts can this amount of acidification have on the environment?

Sample Solution

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