Chapter 15

Chapter 15: Chemical Equilibrium

Dynamic Equilibrium

• All reactions are reversible
• Reaches equilibrium when the concentration of R and P are no longer changing; Rate F = Rate R
  • Reactions are still occurring

Equilibrium constant ($k$)

• Never has units
• k = products over reactants
• Pure liquids and pure solids are NOT included in equilibrium expression
• k_c when using concentration
• Significance of k
  • When k > 1, more products than reactants
  • When k < 1, more reactants than products
  • When k = 1, approximately equal R + P
• Reaction shifts with k
  • k is for reaction forward and 1/k is for the reaction reversed
  • If reaction coefficients are multiplied or divided by a common factor, k gets raised to that power

K in terms of pressure ($k_p$)