Chemical Equlibrium Flashcards
When is a chemical equation in equilibrium’
When the composition of the reactants and products remains constant indefinitely
What does the equilibrium constant (K) represent?
The equilibrium composition of the reaction mixture
The value of 1 (constant) in the equlibrium expression is given to
The concentrations of pure solids and pure liquids at equlibrium
What does the numerical value of the equlibrium constant depend on and what is it independant of?
The reaction temperature and is independant of concentration and/or pressure
How does rise in temperature affect endothermic reactions
increase in equlibrium constant and yield of product is increased
How does rise in temperature affect exothermic reactions
Decrease in equlibrium constant and yield of product is decreased
How does a catalyst affect the equlibrium constant
I doesnt affect it
What equlibrium is present in water and aqueous solutions
Equlibroum between water molecules and hydronium and hydroxide ions
Ionisation of water equation
H2O (l) + H2O (l) ⇌ H₃O⁺ (aq) + OH¯ (aq)
What is H₃O⁺?
Hydronium ion (hydrated proton)
What does amphoteric mean and what is one example of something amphoteric?
Amphoteric - Can react as an acid and base
Example of this is water
What is the ionic product?
The dissociation constant for the ionisation of water
Ionic Product Equation
Kw = [H₃O⁺][OH]
The value of the ionic product varies with
Temperature
At 25 degrees what is the value of the ionic product?
1x10^-14
