Which factor does NOT affect the position of chemical equilibrium according to Le Chatelier's Principle?
Answer and explanation
Correct answer: A. Addition of a catalyst
- Step 1: A catalyst accelerates both forward and backward rates equally without altering Gibbs free energy.
- Step 2: Therefore, adding a catalyst decreases time to reach equilibrium but does NOT alter equilibrium position or equilibrium constant.
Answer
Addition of a catalyst.
Why not the others: 'Change in temperature' alters both position and equilibrium constant K; 'Change in concentration of reactants' shifts equilibrium toward products; 'Change in total pressure for gaseous reactions with unequal mole numbers' shifts equilibrium toward fewer gas moles.
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