Ch 12 Ppt.2
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The larger the value of the equilibrium constant, Kc, what?
the farther the reaction proceeds to the right, before reaching the equilibrium state
If Kc is greater than 103,...
products predominate over reactnants; if Kc is very large, the reaction is said to proceed to completion
If Kc is in the range 10-3 to 103, what?
apreciable concentrations of both reactants and products are present
If Kc is less than 10-3,..
reactants predominate over products; if Kc is very small, the reaction proceeds hardly at all
What is the reaction quotient?
- Qc= [C]tc[D]td / [A]ta[B]tb
What is the relation between reaction quotient and equilibrium constant?
the reaction quotient is defined in the same way as the equilibrium constant, Kc, except that the conceentrations in Qc are not necessarily equilibrium values.
How is the reaction quotient obtained?
by substituting initial concentrations into the equilibrium constant. Predicts reaction direction
- Qc>Kc :system proceeds to form reactants
- Qc=Kc: equilibrium
- Qc<Kc: System proceeds to form products
Knowing Kc allows what?
- us to calculate equilibrium concentrations from initial concentrations.
- We use Initial Change Equilibrium method
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