1. Lecture 41/24/07 Quiz Friday

2. Manipulating K Multiply the equation by a constant Reverse equation Add equations

3. Multiply by a constant 2SO 2 (g) + O 2 (g) ⇄ 2SO 3 (g) K = 283 vs. SO 2 (g) + ½ O 2 (g) ⇄ SO 3 (g) K = ?

4. Reversing the equation 2SO 2 (g) + O 2 (g) ⇄ 2SO 3 (g) K = 283 vs. 2SO 3 (g) ⇄ 2SO 2 (g) + O 2 (g) K = ?

5. Adding equations N 2 (g) + O 2 (g) ⇄ 2NO (g) K 1 = 4.3 x 10 -25 2NO (g) + O 2 (g) ⇄ 2NO 2 (g) K 2 = 6.4 x 10 9 N 2 (g) + 2O 2 (g) ⇄ 2NO 2 (g) K net = ?

6. Le Chatelier’s Principle system at equilibrium Disturb equilibrium Shifts system to new equilibrium Ways to disturb equilibrium

7. Add / Remove  Product /Reactant

8. Example: For the reaction, PCl 3 (g) + Cl 2 (g) ⇄ PCl 5 (g), the system is at equilibrium when [PCl 3 ] = 0.20 M, [Cl 2 ] = 0.125, [PCl 5 ] = 0.6 M. What is the new equilibrium, if the concentrations of Cl 2 is increased by 0.075 M?

9. Volume / Total Pressure change PCl 3 (g) + Cl 2 (g) ⇄ PCl 5 (g) H 2 (g) + I 2 (g) ⇄ 2HI (g) Reduce volume  Increase volume  Add inert gas 