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Common Ion Effect—Chemical Demonstration Kit

By: The Flinn Staff

Item #: AP7043 

Price: $65.61

In Stock.

The Common Ion Effect Chemical Equilibrium Demonstration Kit encourages students to observe a series of changes when ions are added to solutions at equilibrium. The results illustrate the nature of equilibrium and Le Chateliers principle.

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Product Details

In this set of demonstrations, students observe a series of dramatic changes when common ions are added to solutions at equilibrium. The results illustrate the nature of equilibrium and Le Chateliers 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, Le Chateliers 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.


Materials Included in Kit: 
Acetic acid, 2 M, 750 mL
Alizarin yellow R solution, 0.1%, 20 mL
Ammonium chloride, 25 g
Ammonium hydroxide, 0.1 M, 25 mL
Ammonium hydroxide, 1 M, 50 mL
Bromthymol blue solution, 0.04%, 25 mL
Calcium carbonate, 280 g
Hydrochloric acid, 2 M, 750 mL
Phenolphthalein solution, dropper bottle, 1%, 30 mL
Sodium acetate, lab grade, 120 g
Sodium bicarbonate, 50 g
Sodium chloride, lab grade, 100 g
Universal indicator, rainbow acid, 50 mL
Pipet, Beral-type, graduated, 26
Straws, flexi-end, 10

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Analyzing and interpreting data
Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-PS1.B: Chemical Reactions
HS-PS1.B: Chemical Reactions

Crosscutting Concepts

Stability and change

Performance Expectations

HS-PS1-6. Refine the design of a chemical system by specifying a change in conditions that would produce increased amounts of products at equilibrium.