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Unformatted text preview: CHM2021: Chemical Principles 3 Laboratory CJT 01/10 Le Châtelier’s Principle & Equilibrium Lecture Notes Page 1 of 5 Objectives • Provide an accurate definition of Le Chatelier's Principle • Explain how changes in concentration, temperature, and pressure impact a system at equilibrium • Explain what is meant by the term saturated solution . • Explain any changes in solubility observed in the experiment • Explain any color changes observed for each system explored in the experiment Important Definitions • Le Chatelier’s Principle: equilibrium phenomenon where a system at equilibrium responds in a fashion to alleviate stress when a stress, such as pressure, temperature, or concentration change is introduced. • Solubility: measurement of the amount of material dissolved per amount of solvent. • Complex ion: a polyatomic charged particle comprised of one or more ions or molecules (ligands) attached to a central particle via coordinate-covalent bonds. • Common-ion effect: phenomenon where the addition of a solution with an ion in common to an existing equilibrium system causes the system to shift in the reaction direction opposite to the side which contains that common ion. • Saturated solution: a solution which, at a certain temperature, has reached the maximum possible amount of solute it can dissolve. Both solute and the solution containing solvated solute particles coexist. Test Tubes Various Reagents Test Tube Rack CHM2021: Chemical Principles 3 Laboratory CJT 01/10 Le Châtelier’s Principle & Equilibrium Lecture Notes Page 2 of 5 Principles & Explanations Solubility Equilibrium In a saturated solution, the rate at which the solid solute dissociates into ions equals the rate at which the...
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