Equilibrium Constant (K)

• If K>1 the concentration of the products is greater than the concentration of the reactants at equilibrium

• If K<1 the concentration of the reactants is greater than the concentration of products at equilibrium

• If K=1 the equilibrium lies in the middle, favouring neither products or reactants

ICE

• Initial moles

• Change in moles

• Equilibrium moles

Kp constant

• Measured only in gaseous state for gaseous equilibria

• Pressure is measured in Pascals (as is partial pressure) - unless specified as atmospheres

• Kp = (partial pressure of product A x partial pressure of product B) / partial pressure of reactants:

  

  • the number of moles is put as to the power of the partial pressure of that substance - shown by the equation above

Partial pressure = (moles of specific substance / total moles) x total pressure