Under what conditions does changing the pressure have no effect upon the position of equilibrium?
I. When the total pressure is changed by adding an inert gas.
II. When the total number of moles of gas on the reactant side equals the total number of moles of gas on the product side.
III. When all substances present at equilibrium are aqueous phases.

Question

Quizplus · Accepted Answer

Changing the pressure has no effect on the position of equilibrium under all three conditions listed: I) Adding an inert gas at constant volume does not change the partial pressures of the reactants or products, thus not affecting the equilibrium position. II) If the total number of moles of gas on both sides of the reaction is the same, changes in pressure will equally affect both sides, leaving the equilibrium position unchanged. III) Changes in pressure have no effect on reactions where all substances are in the aqueous phase, as their concentrations are not influenced by pressure changes.

Under What Conditions Does Changing the Pressure Have No Effect