Lesson Plan

Chemical Equilibrium and Le Chatelier’s Principle

Henri-Louis Le Chatelier wrote many papers throughout his 85-year life, but he is remembered for one of his earliest discoveries, now known as Le Chatelier's Principle. The final lesson in an 11-part series encourages young chemists to experiment with Le Chatlier's Principle by applying stress on five different chemical systems at equilibrium. They observe the changes in color and precipitates before answering analysis questions.


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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Prepare a large batch of aqueous ammonia and iron (III) thiocyanate before class for everyone to share
Classroom Considerations
  • Use caution with open flames and chemicals as all of the chemicals in this experiment can cause chemical burns
  • Stress the importance of not pointing the heated tube at anyone as there is a chance the chemicals could splatter out of the tube
  • Includes a pre-lab assignment verifying that pupils understand the instructions
  • Lists all chemical formulas used in the experiment
  • None
Common Core