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Le Chatelier’s Principle

Le Chatelier’s Principle. Disrupting Equilibrium. Equilibrium can be disrupted by: changing concentrations of reactants and/or products changing the temperature changing the pressure (gaseous reactions)

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Le Chatelier’s Principle

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  1. Le Chatelier’s Principle

  2. Disrupting Equilibrium Equilibrium can be disrupted by: • changing concentrations of reactants and/or products • changing the temperature • changing the pressure (gaseous reactions) When equilibrium is disrupted, the rate of the forward rxn no longer equals the rate of the reverse rxn

  3. Le Chatelier’s Principle • a way of predicting what happens to the relative rates of the forward and reverse reactions when equilibrium is disrupted The Law: • when a system at equilibrium is upset, the system responds by changing in a way which counteracts ( undoes) the disturbance • eventually equilibrium is restored

  4. Changing Concentration

  5. Changing Temperature

  6. Changing Volume NOTE: only impacts reactions involving gases

  7. Adding a Catalyst

  8. Adding an Inert Gas

  9. Examples 1) N2O4 (g)  2 NO2 (g) ΔH = + 24kJ/mol colourless brown

  10. Examples 1) N2O4 (g)  2 NO2 (g) ΔH = + 24kJ/mol colourless brown

  11. Example 1) N2O4 (g)  2 NO2 (g) ΔH = + 24kJ/mol colourless brown

  12. Examples 1) N2O4 (g)  2 NO2 (g) ΔH = + 24kJ/mol colourless brown

  13. Examples 1) N2O4 (g)  2 NO2 (g) ΔH = + 24kJ/mol colourless brown

  14. Examples 1) N2O4 (g)  2 NO2 (g) ΔH = + 24kJ/mol colourless brown

  15. Showing LCP Graphically T  new equilibrium Initial equilibrium rate of forward greater than rate of reverse

  16. Impact of Temperature on K Ex. From the previous graph, calculate K for the initial equilibrium and for the new equilibrium. On board

  17. Impact of Temperature on K

  18. Example [Co(H2O)6 ]2+ (aq) + 4Cl- (aq)  CoCl42- (aq) + 6 H2O (l) Pink Blue

  19. Example [Co(H2O)62+ (aq) + 4Cl- (aq)  CoCl42- (aq) + 6 H2O (l) Pink Blue

  20. Example [Co(H2O)62+ (aq) + 4Cl- (aq)  CoCl42- (aq) + 6 H2O (l) Pink Blue

  21. Example [Co(H2O)62+ (aq) + 4Cl- (aq)  CoCl42- (aq) + 6 H2O (l) Pink Blue

  22. Example [Co(H2O)62+ (aq) + 4Cl- (aq)  CoCl42- (aq) + 6 H2O (l) Pink Blue Based on the observations, is the forward rxnendo or exothermic?

  23. Example [Co(H2O)62+ (aq) + 4Cl- (aq)  CoCl42- (aq) + 6 H2O (l) Pink Blue Based on the observations, is the forward rxnendo or exothermic? ENDO

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