Equilibrium Flashcards
Effect of increasing temperature on Kc value for an exothermic reaction
The position of the equilibrium will shift to the left to decrease the change meaning there is more reactant and less product. This will decrease the value of Kc.
Kc=
[product]x[other products]/[reactant]x[other reactants]
Effect of decreasing temperature on Kc value for an exothermic reaction
The position of the equilibrium will shift to the right to decrease the change, meaning there is more product and less reactant. This will increase the value of Kc.
Effect of increasing temperature on Kc value for an endothermic reaction
The equilibrium will shift to the right to decrease the change, meaning there is more product and less reactant. This will increase the value of Kc.
Effect of decreasing temperature on Kc value for an endothermic reaction
The position of the equilibrium will shift to the left to decrease the change, meaning there is less product and more reactant. This will decrease the value of Kc.
The value of Kc is unaffected by..
- changes in concentration
- changes in pressure
- addition of a catalyst
When Kc is bigger than 1…
The reaction is product favoured.
When Kc is smaller than 1…
The reaction is reactant favoured
How do you find Ka from pKa?
10^-pKa
How do you find pKa?
-logKa
The smaller the PKa value…
The stronger the acid
What is a weak acid?
Only partially dissociates in aqueous solution.
What is a strong acid?
Completely dissociates in solution.
Ka=
Ka=[H+][A-]/[HA]
What are the units of Ka?
Mol/dm^3
