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Common Ion Effect - Chemical Demonstration Kit

by Flinn Scientific

Item #: AP7043

Price: $53.30

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 LeChâtelier's principle.

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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.