3.1.3 Equilibrium Constant

Question 1

define homogeneous system?

Answer 1

• same states

Question 2

define heterogeneous systems

Answer 2

different states

Question 3

what is the equilibrium constant law?

Answer 3

• indicates the relationship between products and reactant concentrations at equilibrium

Question 4

what is the magnitude of the equilibrium constant and what does it mean?

Answer 4

• tells us the extent of the reaction
  1. Kc = 1
• concentration of the products is equal to the concentration of the reactants
• equilibrium position is in the middle
  2. kc > 1
• concentration of the products is greater than the concentration of the reactants
• equilibrium position is to the left
  3. Kc < 1
• concentration of the products is less than the concentration of the reactants
• equilibirum position is to the left

Question 5

what is the assumption for when Kc is smaller than x10^-4?

Answer 5

• x can be ignored when so small compared to the concentrations
• assumption that the concentration of reactants initially, is equal to the concentration of reactants at equilibrium

Question 6

how can you predict quantitatively if a system is at equilibrium?

Answer 6

• calculate q
  1. if Q = Kc
• the system is at equilibirum
  2. if Q > Kc
• reaction is proceeding to the left
• increasing concentration of reactants and decreasing concentration of products
  3. if Q < Kc
• reaction is proceeding to the right
• increasing concentration of products and decreasing concentration of reactants