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AQA A Level Chemistry復(fù)習(xí)筆記1.8.3 The Equilibrium Constant, Kc

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年6月30日 下午2:32

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:

1.7-Equilibria-Equilibrium-Expression

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:

  1. Ag+?(aq) + Fe2+?(aq)?? Ag (s) + Fe3+?(aq)
  2. N2?(g) + 3H2?(g)?? 2NH3?(g)
  3. 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:

    • ?

 

轉(zhuǎn)載自savemyexams

 

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