U2-1-1 - Equilibrium Constants Flashcards
What is K?
The equilibrium constant
must be capital K
Where do the powers a b c d come from?
The balanced equation
(number in front of each species)
What do the square brackets [] mean?
Concentration
(in mol l-1)
What are the units of K?
K has no units
Write an equilibrium expression for:
2SO2(g) + O2(g) ⇌ 2SO3(g)
What does it mean if K > 1?
Products are favoured
(High yield of product)
What does it mean if K < 1?
Reactants are favoured
(Low yield of product)
The value of K depends only on …
temperature.
In equilibrium constant calculations:
The concentration of liquids and solids is always …
1
Heat is added to an exothermic reaction.
The value of K will …
decrease.
Heat is added to an endothermic reaction.
The value of K will …
increase.
If a catalyst is added, the value of K…
doesn’t change.
Only the initial concentration is given for a reactant.
What must be done before calculating K?
Must find the equilibrium concentration.
initial c – used up c = equilibrium c
