Colorful Electrolysis - Chemical Demonstration Kit
By: Mike Shaw , West Stokes High School, King, NC
Item #: AP6467
With the Colorful Electrolysis Oxidation-Reduction Chemical Demonstration Kit, present electrolysis in a very colorful and dramatic way on an overhead projector. A 9-V battery supplies power and universal indicator provides a color show.
Demonstrate simple electrolysis in a very colorful and dramatic way on your overhead projector. A 9-V battery supplies the power and universal indicator provides the color show. As electrolysis occurs in the Petri dish, the pH changes at the anode and cathode are different. The solution around the cathode immediately turns purple as hydrogen gas bubbles are formed. At the anode, oxygen is produced and the solution turns orange/red in color. Across the entire Petri dish the entire spectrum of universal color changes occur reflecting the pH continuum created in the Petri dish. Teacher Demonstration Notes are included. Enough materials are included to perform the demonstration seven times.
Concepts: Electrolysis, pH.
Time Required: 15 minutes
Materials Provided: 9-V battery, battery clips, pencil leads, Petri dishes, sodium sulfate solution, universal indicator solution.