Lecture 5 Chapters 4 et al. (Equilibrium and Acid-Base)

# Lecture 5 Chapters 4 et al. (Equilibrium and Acid-Base) -...

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Equilibrium Continued (Chapters 4.7, 17.1-17.5) Lecture 5, September 15 2009

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The ICE method: “INITIAL, CHANGE, EQUILIBRIUM” Example: At 100 o C, K p = 6.7 x 10 -9 for the following reaction: COCl 2 (g) CO (g) + Cl 2 (g) Calculate the equilibrium partial pressure of CO at 100 o C in a chamber that contains COCl 2 at a pressure of 0.228 atm.

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A Different Type of Example : The atmospheric oxidation of nitrogen monoxide, 2NO (g) + O 2 (g) 2NO 2 (g), was studied at 184 o C with initial pressures of 1.000 atm of NO and 1.000 atm of O 2 . At equilibrium, P O2 = 0.506 atm. Calculate K p .

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Solving Equilibrium Problems using an ICE table and the Simplifying Approximation: When K is very small and the initial reaction concentration is relatively large, you can often neglect the concentration change (x) with respect to the number it is subtracted from without introducing significant error into the calculation. Always check your assumption (if percent error is less than 5%, then
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## Lecture 5 Chapters 4 et al. (Equilibrium and Acid-Base) -...

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