What is the effect on equilibrium if more reactant is added?

When more reactant is added to a system at equilibrium, Le Châtelier's principle applies. This principle states that if a stress is applied to a system at equilibrium, the system will adjust to counteract that stress and restore a new equilibrium.

In the case of adding more reactant, the immediate effect is an increase in the concentration of reactants. To counteract this change, the system will shift in the direction that consumes the added reactant, which typically means it will shift towards the product side. This shift leads to the production of more products until a new equilibrium is established.

Thus, the correct interpretation of the effect of adding more reactant is that the equilibrium will shift to the right, resulting in the formation of more product. This understanding reinforces the importance of concentration changes on the position of equilibrium in chemical reactions.