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17.1 The equilibrium law


Here are experiments our science specialists have selected to support the IB* topic.


The Determination of an Equilibrium Constant

Experiment #10 from Advanced Chemistry with Vernier

In this experiment, you will

  • Prepare and test standard solutions of FeSCN2+ in equilibrium.
  • Test solutions of SCN of unknown molar concentration.
  • Determine the molar concentrations of the ions present in an equilibrium system.
  • Determine the value of the equilibrium constant, Keq, for the reaction.


Chemical Equilibrium: Finding a Constant, Kc

Experiment #20 from Chemistry with Vernier

In this experiment, you will determine the equilibrium constant, Kc, for the following chemical reaction:

{\text{F}}{{\text{e}}^{{\text{3 + }}}}{\text{(aq) + SC}}{{\text{N}}^{\text{ - }}}{\text{(aq)}} \leftrightarrow {\text{FeSC}}{{\text{N}}^{{\text{2 + }}}}{\text{(aq)}}
{\text{iron(III) + thiocyanate}} \leftrightarrow {\text{thiocyanoiron(III)}}

Investigating LeChatelier’s Principle

Experiment #13 from Vernier Chemistry Investigations for Use with AP* Chemistry

This investigation will take advantage of your knowledge of LeChatelier’s Principle. It may also deepen understanding of equilibrium in general. The objective is to prepare six equilibrium systems in a set of test tubes that display the colors red, orange, yellow, green, blue, and violet.

Educational Standard
International Baccalaureate (IB)
Additional Higher Level (AHL)
17. Equilibrium

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.