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CHEM 1011

CHEM 1011. Experiment 17: The Law of Chemical Equilibrium and the Le Chatelier Principle. Objectives. To study chemical equilibria . To investigate the effects of (1) changing concentrations and (2) changing temperature in equilibrium reactions. Introduction.

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CHEM 1011

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  1. CHEM 1011 Experiment 17: The Law of Chemical Equilibrium and the Le Chatelier Principle

  2. Objectives • To study chemical equilibria. • To investigate the effects of (1) changing concentrations and (2) changing temperature in equilibrium reactions.

  3. Introduction • Equilibrium: the rate of the forward reaction equals the rate of the reverse reaction.

  4. Introduction • Le Chatelier Principle: If an external stress is applied to a system in equilibrium, the system reacts in such a way as to partially relieve the stress.

  5. Introduction • Concentration: Removing or adding reactants can shift equilibrium to the left or right. • Common Ion Effect. • Spectator ions may influence equilibrium.

  6. Introduction • Temperature: heat can act as a product or reactant. • In endothermic reactions, heat can be considered a reactant and equilibrium will shift to the right. • In exothermic reactions, heat can be considered a product and equilibrium will shift to the left.

  7. Chemicals and Equipment • 0.1 M CuSO4 • 1 M NH3 • 1 M HCl • Saturated NaCl • Concentrated HCl • 0.1 M KSCN • 0.1 M FeCl3

  8. Chemicals and Equipment(cont.) • 1 M CoCl2 • H2PO4-/HPO42- solution • Litmus paper

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