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Common Ion Effect - Chemical Demonstration Kit

Common Ion Effect -
Chemical Demonstration Kit, AP7043
Catalog Number
Common Ion Effect - Chemical Demonstration Kit
Product Description

By: The Flinn Staff

In this set of three demonstrations, students will observe a series of dramatic changes when common ions are added to solutions at equilibrium. The results illustrate the nature of equilibrium and LeChâtelier's principle.

• Adding strong and weak acid solutions to cylinders containing a white powder causes the cylinders to overflow with colorful foam.
• Blowing bubbles into a blue solution changes the color of the solution to yellow. Stirring in a white powder causes the solution to revert back to blue. Blowing again into the solution returns the original yellow.
• Adding a clear liquid to a yellow solution produces an orange mixture. Stir in a white powder and the yellow reappears. Repeating the procedure sets up a color oscillation.

Includes Teacher Demonstration Notes and enough materials to perform each demonstration seven times.

Concepts: Common ion effect, equilibrium, LeChâtelier's principle.
Time Required: 20 minutes
Chemicals Provided: Hydrochloric acid, acetic acid, sodium acetate, sodium chloride, sodium bicarbonate, sodium carbonate, ammonium hydroxide, ammonium chloride, phenolphthalein solution, bromthymol blue solution, alizarin yellow R solution.

Additional Resources
No Additional Resources at the time.
Flinn Catalog/Reference Manual Page 360
P.O. Box 219, Batavia, IL60510



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