In the College Level Guided-Inquiry Lab Kit Applications of Le Chatelier’s Principle, investigate six chemical equilibrium systems to analyze patterns and trends in the principles and concepts of equilibrium.
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In this guided-inquiry lab, students investigate six chemical equilibrium systems to analyze patterns and trends in the principles, concepts and definitions of equilibrium.
Students begin with an activity that introduces the properties of a system at equilibrium: the reversible complex-ion reaction between iron(III) nitrate and potassium thiocyanate. Deliberate “stresses,” such as temperature changes and changes in the amounts of reactants and products, are added to the system and students analyze the resulting color changes. This procedure provides a model for guided-inquiry analysis of five additional equilibrium systems. Inquiry activities include a reversible acid–base indicator reaction, copper and cobalt complex ions, gas–liquid solubility of carbon dioxide and the solubility of magnesium hydroxide. For convenience, these systems may be set up as lab stations. Students may also be tasked to create a rainbow-colored display using the equilibrium systems as an optional extension or cooperative class activity.This inquiry lab integrates essential science practice along with analyzing evidence based on data to construct explanations of natural phenomena. Complete for 24 students working in pairs.