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lecture_02_04_10

lecture_02_04_10 - Today Dependence of equilibria on...

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1 02-04-10 Today Dependence of equilibria on temperature and pressure Equilibrium calculations Chapter 16 (Acid Base Chemistry) Arrhenius, Brønsted-Lowry, and Lewis acids and bases. Kw, pH, and pOH. Tuesday (02-9-10) Strong acids and bases. Weak acids and bases. pH calculations. Polyprotic acids. Announcements Tue office hour (room 210) will be at 1-2 pm Δ V>0 Compressing a volume generating ( Δ n>0) chemical reaction drives the reaction backwards: Compressing a volume consuming ( Δ n<0) chemical reaction drives the reaction forward: 2 SO 2 + O 2 2 SO 3 2 SO 2 + O 2 2 SO 3 Δ V<0 Changes of system pressure or system volume…. . 1. Add or remove gaseous reagent/product (= effect see previous page) 2. Change system volume Volume consuming reaction N 2 O 4 (g) 2 NO 2 (g) N 2 O 4 (g) 2 NO 2 (g) Volume producing reaction
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2 Volume change does not affect K, K P , or K C ! N 2 O 4 (g) 2 NO 2 (g) K c does not change upon volume change, but equilibrium composition can, if Δ n=0.
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