Lab 5: Soap Making – How Does Soap Make You Clean?

[Pages:1]Grading Rubric

Chemistry 108, Spring 2017

Lab 5: Soap Making ? How Does Soap Make You Clean?

General Guidelines: ? Please type the lab write-up so that we can read it, with the exception of artwork

or mathematical calculations (those can be neatly written in pencil/pen).

? Name/Date/Title of lab on top of the first page ? Header or footer with your name and page # on subsequent pages ? Please staple

Lab 5: Soap Making

Points

Points

Earned

Possible

Article for Odyssey: Adventures in Science Magazine

Paragraph about how soap works (water and oil do not mix, yet soap

dissolves in both; how, in general, does this work?). Include the chemistry

10 points

of how soap works, incorporating a discussion of micelles.

What is meant by the term "hard water"

3 points

Why soap is not as effective in hard water

8 points

Is the report coherent and complete (observations and discussion of results incorporated into the article)?

7 points

Are there major grammar mistakes and spelling errors?

5 points

Discussion of Results (providing specific examples from observations for each question)

1. How did each sample (your soap, store soap, detergent, and shampoo) compare in sudsing action in deionized water?

5 points

2. How did each sample (your soap, store soap, detergent, and shampoo) compare in sudsing action in tap water?

5 points

3. How did each sample (your soap, store soap, detergent, and shampoo) compare in sudsing action in hard water?

5 points

4. How did each sample (your soap, store soap, detergent, and shampoo) compare in sudsing action in oil?

5 points

5. Based on your observations, does soap generally work better in soft or hard water?

5 points

6. Based on your observations, which works better in hard water -- soap or detergent?

5 points

7. From your observations, would you conclude that shampoo is more like soap or detergent? Explain your answer.

5 points

Are the Observations Included?

Part Two: Testing the Products in Deionized Water - Observations for all four test tubes

8 points

Part Three: Testing the Products in Tap Water - Observations for all four test tubes

8 points

Part Four: Testing the Products in Hard Water - Observations for all four test tubes

8 points

Part Five: Testing the Products in Oil - Observations for all four test tubes

8 points

Total Points

100 points

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