Chapter 14 - Chapter 14: Equilibrium (reversible reactions...

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Chapter 14: Equilibrium (reversible reactions w/ no input of energy) I. Reversible Reactions a. A + B → C + D b. C +D → A + B c. Metabolism i. C 6 H 12 O 6 + 6H 2 O → 6CO 2 + 6H 2 O ii. 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6H 2 O d. All species are present in solution because reaction and reverse reaction happens continuously i. Dynamic Equilibrium – rate of rxn and reverse rxn are equal ii. NH 3 + H 2 O NH 4 + + OH - 1. NH 3 , H 2 O, NH 4 + , OH - II. Law Mass Action a. Determines concentrations at equilibrium b. aA +bB cC + dD i. ([C] c [D] d )/([A] a [B] b ) = K c ii. K c = equilibrium constant iii. [ ] in mol/L c. Ex.: N 2(g) + 3H 2(g) 2NH 3(g) i. K c = [NH 3 ] 2 /([N 2 ][H 2 ] 3 ) d. Large K c = large left to right (forward) reaction i. Reactants are very reactive (unstable) ii. Products are less reactive (more stable) iii. Ex.: Strong acid in water iv. Limiting reagent is almost completely consumed e. Small K c = large right to left (reverse) reaction i. Reactants are less reactive (more stable)
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This note was uploaded on 01/27/2011 for the course CHEM 0120 taught by Professor Golde during the Spring '07 term at Pittsburgh.

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Chapter 14 - Chapter 14: Equilibrium (reversible reactions...

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