Le Chatelier’s Principle
When a chemical system at equilibrium is perturbed, it re-attains equilibrium
by undergoing a net reaction that reduces the effect of the perturbant.
Perturbants include (a) change in concentration, (b) change in
pressure, (c) change in temperature, or (d) the presence of a catalyst.
PCl3(g) + Cl2(g) PCl5(g)
What happens when we add Cl2 to the system at equilibrium?
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