Question

What is the effect of adding inert gas on equilibrium at a constant pressure for the reaction PCl5 (g) ----PCl3 (g)+ Cl2(g). i. e. Will the reaction shift on forward or backward direction ? and how.

Answer 1

If an inert gas is added in the reactant side of the equation, forward reaction will take place as the pressure was in equilibrium.

Before adding the inert gas the pressure in the chamber was under equilibrium. But when inert gas was added the pressure in the reactant side increases thus to balance the pressure in the chamber forward reaction will take place resulting in the change of PCl5 to Pcl3 and Cl.

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Answer 2

As the gas is inert the only effect it will produce is the partial pressure change
So inert gas will add up some partial pressure to the reaction. So pressure becomes increased the reaction will shift to backward direction because number of moles of reactant are 1 and products are 2 so the reaction will go the the reducing number of mole side to lower the increased pressure