ICETableIntro - So, How Much Do W e Really Have?...

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Unformatted text preview: So, How Much Do W e Really Have? Equilibrium Expr essions and ICE T ables Intro to ICE Tables PCl 5 , has a K a of 6.8 x 10-4 What are the [PCl 5 ], [PCl 3 ] , and [Cl 2 ] in 0.75M PCl 5 ? PCl 5 (g) ! PCl 3 (aq) + Cl 2 (aq) Molarity PCl 5 (aq) PCl 3 (aq) Cl 2 (aq) I E C Initial concentration Change in concentration Equilibrium concentration PCl 5 , has a K a of 6.8 x 10-4 What are the [PCl 5 ], [PCl 3 ] , and [Cl 2 ] in 0.75M PCl 5 ? PCl 5 (g) ! PCl 3 (aq) + Cl 2 (aq) Molarity PCl 5 (aq) PCl 3 (aq) Cl 2 (aq) I E C Let x = the concentration of PCl 5 that dissociates 0.75-x +x +x 0.75 - x x x K a = [Cl 2 ] [PCl 3 ] [PCl 5 ] (x)(x) (0.75 - x) = x 2 (0.75-x) = 6.8 x 10-4 x = 0.022 M [Cl 2 ] = [PCl 3 ] = 0.022 [PCl 5 ] = 0.728 x 2 + (6.8 x 10-4 )x (5.1 x 10-4 ) = 0 Another ICE Table Calculate the final concentrations of the products and reactants when 0.044M H 2 mixes with 0.044M I 2 . (K a = 0.16) H 2 + I 2 ! 2 HI Molarity H 2 I 2 HI I E C 0.044 0.044-x-x +2x 0.044 - x 0.044-x 2x...
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ICETableIntro - So, How Much Do W e Really Have?...

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