Equilibrium Constant Equilibrium Constant (K (K eq eq ) ) A constant which can tell A constant which can tell you which side of an you which side of an equilibrium is favored equilibrium is favored under certain conditions. under certain conditions. [http://cwx.prenhall.com/petrucci/medialib/media_portfolio/text_images/TB16_03.JPG]
Equilibrium Constant (K eq ). A constant which can tell you which side of an equilibrium is favored under certain conditions. [http://cwx.prenhall.com/petrucci/medialib/media_portfolio/text_images/TB16_03.JPG]. Equilibrium Constant (K eq ). When K eq is large, reaction favors the products. - PowerPoint PPT Presentation
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A constant which can tell you which A constant which can tell you which side of an equilibrium is favored side of an equilibrium is favored under certain conditions.under certain conditions.
The equilibrium constant can be The equilibrium constant can be used to calculate the used to calculate the concentrations (Molarity!) when a concentrations (Molarity!) when a reaction reaches equilibrium.reaction reaches equilibrium.
][reactants
[products]Keq
Equilibrium CalculationsEquilibrium Calculations
Example Reaction:Example Reaction: A + B C + D⇆A + B C + D⇆
[A][B][C][D]
Keq
““[ ]” means molarity values!!![ ]” means molarity values!!!
Equilibrium CalculationsEquilibrium Calculations
Reactions with coefficients:Reactions with coefficients: 2 NO2 NO22 (g) (g) N⇆ N⇆ 22OO44 (g) (g)
22
42eq ][NO
]O[NK
Coefficient becomes a
power!
Equilibrium CalculationsEquilibrium Calculations
Include only gases and aqueous Include only gases and aqueous solutions (aq):solutions (aq):
C (s) + HC (s) + H22O (g) O (g) CO (g) + H⇆ CO (g) + H⇆ 22 (g) (g)
O][H
][CO][HK
2
2eq
Solids not included!
Equilibrium CalculationsEquilibrium Calculations
Example:Example: HH22 (g) + I (g) + I22 (g) 2 HI (g)⇆ (g) 2 HI (g)⇆ If the concentrations are:If the concentrations are:
– HH22=0.10 M=0.10 M
– II22=0.10 M=0.10 M
– HI=0.20 MHI=0.20 M
– What is KWhat is Keqeq??
]][I[H[HI]
K22
2
eq
[0.1][0.1][0.2]
K2
eq
4.0Keq
Reaction Quotient (Q)Reaction Quotient (Q)
Calculation for the reaction and Calculation for the reaction and compare to Kcompare to Keqeq