The Equlibrium Constant Flashcards
What factor affects Kc?
Temperature
What does the calculated value of Kc suggest about the position of equilibrium?
The larger the Kc, the further towards the products lies the position of equilibrium
What is homogenous equilibrium?
An equilibrium where all the species contain the same state
What is a heterogenous equilibrium?
An equilibrium that contains species of different states
Which species are included in a Kc expression?
Only gaseous and aqueous
Why are solids and liquids omitted from Kc expressions?
They are assumed to be essentially constant
What happens to the equilibrium constant if the temperature of a system is increased?
If forwards reaction is EXOTHERMIC:
- K decreases with increasing temperature
- as the position of equilibrium shifts towards the reactants in the direction of the endothermic reaction to decrease temperature
- this decreases the product yield
(Allow converse if forward reaction is endothermic)
How does an increasing concentration/ pressure affect Kc?
Kc is unaffected:
- the ratio of the numerator and denominator of Kc change
- so the position of equilibrium shifts to restore Kc
Why is it difficult to predict the position of equilibrium when both temperature and pressure are changed?
Difficult to predict relative contributions of two opposing factors
