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The Aloha Chemical Sunset—Chemical Demonstration Kit

By: David A. Katz, Retired, Wilmington, DE

Item #: AP8988

Price: $24.50

The Aloha Chemical Sunset Chemical Demonstration Kit shows how light passing through a colloidal suspension is affected by the size of the colloidal particles. Two solutions are mixed, producing a spectacular multicolored “sunset.”

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This item can only be shipped to schools, museums and science centers

Product Details

Do you and your students need a spring break already? If you can’t see a Hawaiian sunset in person, simulate it in the classroom! This fun demonstration shows how light passing through a colloidal suspension is affected by the size of the colloidal particles—this is known as the Tyndall effect. Two solutions are mixed in a Petri dish on an overhead projector, producing a spectacular multicolored “sunset.”

Concepts: Colloids and precipitates, Tyndall effect/light scattering.
Time Required: 10–15 minutes
Materials Provided: Sodium thiosulfate solution, hydrochloric acid solution, Petri dish, chemical sunset cutouts.