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Writing with Electricity - Chemical Demonstration Kit

Writing with Electricity -
Chemical Demonstration Kit, AP7312
Catalog Number
Writing with Electricity - Chemical Demonstration Kit
Product Description

By: Paul Price, Trinity Valley School, Fort Worth, Texas

Get a charge out of writing with electricity! Demonstrate the key concepts of electrochemistry, including anodic and cathodic reactions, by using a copper “pen” to follow the flow of electrons in the electrolysis of aqueous potassium iodide. Students will observe secret messages that appear in filter paper containing starch and phenolphthalein indicators. The blue-black starch iodine complex is visible when the copper pen is negative, and the red color of phenolphthalein in base appears when the pen is positive. Identify the reactions responsible for each color change—and watch the electrons and concepts flow! Enough materials are included to perform the demonstration seven times.

Concepts: Electrochemistry, acid–base indicators.
Time Required: 15 minutes
Materials Provided: Potassium iodide, starch, phenolphthalein indicator solution, aluminum pan, filter paper, 9-V battery, battery clips, copper wire, and disposable pipets.


Additional Resources
No Additional Resources at the time.
Flinn Catalog/Reference Manual Page 376
Flinn Middle School Catalog/Reference Manual Page 432
P.O. Box 219, Batavia, IL60510



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