L12_equil2.115b_08

L12_equil2.115b_08 - L12: Mass Action Law: Equilibrium...

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L12: Mass Action Law: Equilibrium constant - gases: enter as pressure, in atm - dissolved species: enter as concentration, M - pure solids/liquids: do not appear in equations, including solvents which take part in chemical rxn (provided the solutions are dilute) - All values in the expression of K - Equilibrium values - current values - Rxn quotient Q - Using reference conc and pressures: no units are needed b a d c B A D C K ] [ ] [ ] [ ] [ = b B a A d D c C P P P P K = dD cC bB aA + + Today: 1. Equilibrium problems 2. Le Chatelier Principle
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3 2 1 2 2 3 H N NH P P P Q = N 2 + 3H 2 Æ 2NH 3 b B a A d D c C P P P P Q = Many sets of pressures of reactants And products can give same K
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Strategy for Solving Equilibrium Problems 1. Write the balanced eqn 2. Write the equilibrium expression: Law of Mass Action 3. List the initial concentrations 4. Calculate Q and determine the direction of change 5. Define change (x) with respect to reactants and products using the balanced equation 6. Define equilibrium concentrations 7. Use equil. conc. in equil. expression and solve for unknowns dD cC bB aA + + initial conc.(or p): change: equil. conc. (or p):
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L12_equil2.115b_08 - L12: Mass Action Law: Equilibrium...

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