AQA A Level Chemistry復習筆記1.8.3 The Equilibrium Constant, Kc
The Equilibrium Constant, Kc
Equilibrium expression & constant
- The?equilibrium expression?links the?equilibrium constant,?Kc, to the?concentrations of reactants and products?at equilibrium taking the?stoichiometry?of the equation into account
- So, for a given reaction:
aA + bB ? cC + dD
the?Kc?is defined as follows:
Equilibrium expression linking the equilibrium concentration of reactants and products at equilibrium
- Solids?are ignored in equilibrium expressions
- The?Kc?of a reaction is specific and only changes if the?temperature?of the reaction changes
Worked Example
Deducing equilibrium expressions
Deduce the equilibrium expression for the following reactions:
- Ag+?(aq) + Fe2+?(aq)?? Ag (s) + Fe3+?(aq)
- N2?(g) + 3H2?(g)?? 2NH3?(g)
- 2SO2?(g) +?O2?(g)?? 2SO3?(g)
Answer 1:
-
- [Ag (s)] is not included in the equilibrium expression as it is a solid
Answer 2:
Answer 3:
-
- ?
- ?
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