1. Equilibrium Problems Chapter 17.3

2. 2 Steps for Solving Equilibrium Problems 1.______________________ 2.______________________ 3.______________________ 4.______________________ 5.______________________

3. Example #1 For the reaction: A + 3B  2C initially If initially[A] = 0.500 M, [B] = 1.5 M [C] = 0 M and at equilibrium [C] = 0.60 M, determine the concentrations of A,B, and the K c at equilibrium

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5. 5 Example #2 Solve for the [B] o for the following equilibrium system: A + 3B  2C K c = 35 [C] o = 0.30 M, [A] o = 0.80 M, [A] eq = 0.40 M

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7. Example #3 The K c for the reaction below is 1.80 x 10 -4 HCHO 2 (aq)  H + (aq) + CHO 2 - (aq) If [HCHO 2 ] = 0.200 M initially, determine the concentration of H + at equilibrium.

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9. 9 K sp Even insoluble compounds dissolve a little! Read in your book: Predicting Precipitates and Common Ion Effect.

10. 10 K sp example AgCl (s)  Ag + (aq) + Cl - (aq) K sp = 1.8 x 10 -10 What is the concentration of silver ion in solution when silver chloride precipitate forms in a reaction?

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12. ICE Practice #1 In an experiment, 0.100 mol of A and 0.100 mol of B are mixed in a 0.500 L container. At equilibrium 0.060 mol of C are present. Determine the equilibrium constant (K c ) for this reaction. The equation for this reaction is: 2A + B  3C + 4D

13. ICE Practice #2 K c = 3.8 x 10 -6 for the following reaction: H 2 C 2 O 4 (aq)   2H + (aq) + C 2 O 4 2- (aq) Initially 45 grams of oxalic acid are dissolved in 0.250 L of solution. What is the equilibrium concentration of each species?

14. 14 K sp Practice Determine the K sp for a solution containing silver chromate. The [Ag + ] at equilibrium is 1.03 x 10 -4.