Equilibrium

Chemistry · Class 11

Simulation · Chemistry · Class 11

Rolling downhill to equilibrium

From the lesson K, Q and Gibbs energy in Equilibrium. Change the values and watch what happens.

Rolling downhill to equilibriumChemistry · Class 11

The idea behind it

NCERT § "Relationship between Equilibrium Constant K, Reaction Quotient Q and Gibbs Energy G"

  • ΔG = ΔG° + RT ln Q for a reaction mixture of any composition.
  • At equilibrium ΔG = 0 and Q = K, giving ΔG° = −RT ln K = −2.303 RT log K.
  • K = e^(−ΔG°/RT); a negative ΔG° means K > 1 and a positive ΔG° means K < 1.
  • When ΔG < 0 the forward reaction proceeds (Q < K); when ΔG > 0 the reverse is favoured (Q > K).
  • Use R = 8.314 J K⁻¹ mol⁻¹ with ΔG° in J mol⁻¹, not kJ mol⁻¹.