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Product 12523

By: Penney Sconzo, Westminster Academy, Atlanta, GA

The Organic Rainbow Chemical Demonstration Kit uses universal indicator to vividly display a hydrolysis reaction. The hydrolysis reaction gradually increases the pH to display the rainbow colors of universal indicator.

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Product Details

Add a clear liquid to a red solution and watch as the colors of the rainbow appear in sequence. But wait, there’s more! After a few seconds, the colors of the solution mysteriously reverse directions—switching from violet to blue, green, yellow, orange and finally back to red. Add more clear liquid and the color cycle repeats. This demonstration uses universal indicator to vividly display the hydrolysis reaction of tert-butyl chloride. The hydrolysis reaction produces acid that is slowly consumed by the clear base solution—gradually increasing the pH to display the rainbow colors of universal indicator. Once the base is fully depleted, acid concentration builds up again, thereby reversing the color change back to red. A detailed worksheet is provided for students to record their observations and form conclusions about the reaction they are viewing. Teacher Demonstration Notes included.  

Concepts: Organic chemistry, hydrolysis, indicators.
Time Required: 15 minutes
Note: A 500-mL graduated cylinder or hydrometer cylinder is required and available separately.

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Asking questions and defining problems

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Scale, proportion, and quantity
Systems and system models
Energy and matter

Performance Expectations

MS-PS1-1: Develop models to describe the atomic composition of simple molecules and extended structures.
MS-ESS1-2: Develop and use a model to describe the role of gravity in the motions within galaxies and the solar system.
HS-PS2-4: Use mathematical representations of Newton’s Law of Gravitation and Coulomb’s Law to describe and predict the gravitational and electrostatic forces between objects.