NDLI: Soap vs. Shampoo Surfactant Lab

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Soap vs. Shampoo Surfactant Lab

Content Provider	TeachEngineering: STEM curriculum for K-12
Author	Holcomb, Mark Amato, Dahlia Amato, Douglas Patton, Derek L.
Copyright Year	2016
Description	Students learn about the properties of solutions—such as ion interactions, surface tension and viscosity—as they make their own soap and shampoo and then compare their properties. Working as if they are chemical engineers, they explore and compare how the two surfactants behave in tap water, as well as classroom-prepared acidic water, hard water and seawater using four tests: a “shake test” (assessing the amount of bubbles produced), a surface tension test, a viscosity test, and a pH test. Students learn about the properties of solutions—such as ion interactions, surface tension and viscosity—as they make their own soap and shampoo and then compare their properties. Working as if they are chemical engineers, they explore and compare how the two surfactants behave in tap water, as well as classroom-prepared acidic water, hard water and seawater using four tests: a “shake test” (assessing the amount of bubbles produced), a surface tension test, a viscosity test, and a pH test. Then they coalesce their findings into a recommendation for how to engineer the best soap versus shampoo. The activity may be shortened by using purchased liquid soap and shampoo from which students proceed to conduct the four tests. A lab worksheet and post-quiz are provided.
Language	English
Access Restriction	Open
Rights Holder	University of Southern Mississippi Regents of The University of Colorado
Subject Keyword	Chemistry Shampoo Chemical Engineer Liquid Soap Hard Water Surface Tension Acid Viscosity Dilution Salt Water Surfactant Base
Content Type	Text
Time Required	PT1H30M
Education Level	Class IX Class X Class XI Class XII
Pedagogy	Experimental Activity
Resource Type	Hands-on
Subject	Chemistry

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