Chem315-012810

Chem315-012810 - Ch. 6 Chemical Equilibrium Chemical...

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Ch. 6 Chemical Equilibrium
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Chemical Equilibrium -one of the most important concepts in chemistry -analytical reactions almost never yield complete conversion of R P Reactants Products X -almost always an equilibrium concentration of both -C.E. is controlled by the laws of thermodynamics p-chem distilled down to ~Le Ch ȃ telier’s Principle (LCP) -the position of equilibrium always shifts in the direction to relieve the stress on the system -system – what you are interested in -surroundings – everything else Surroundings System Universe = system + surroundings
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dD cC bB aA + + [ ] [ ] [ ] [ ] b a d c eq B A D C K = ( 29 ( 29 ( 29 ( 29 b B a A d d c c eq P P P P K = Reactants Products Ratio of products/reactants = equilibrium constant [ ] – molar concentration (mols/liter) Gases – partial pressures in (atm) If a components is a pure solid or liquid i.e. Ag (s) , H 2 O (l) , [Ag] = 1 replaced by 1 to be constant [H 2 O] = 1
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Autoionization of water in a beaker of water ) ( ) ( ) ( 2 aq aq l OH H O H - + + ) ( ) ( 3 ) ( 2 2 aq aq l OH O H O H - + + + + + O H O H H 3 2 [ ][ ] [ ] 2 2 3 O H OH O H K eq - + = [ ][ ] - + = = OH O H K K w eq 3 14 10 01 . 1 - × = w K [ ] [ ] M OH O H 7 3 10 1 - - + × = = Hydronium ion, theoretical representation of a hydrated + ion, H + Ion product constant for water At 25 C So for pure H 2 O Goes to 1, assume to be constant
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[ ][ ] - + = OH O H K w 3 [ ] [ ] + - = O H OH 3 [ ] [ ] M O H M OH 20 . 0 200 . 0 3 = + = + - [ ] [ ] - + = OH K O H w 3 [ ] 14 14 3 10 5 2 . 0 10
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Chem315-012810 - Ch. 6 Chemical Equilibrium Chemical...

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