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Changing the concentration does not change K because although the concentrations of reactants and products will be different, the overall ration of them in the equilibrium constant will remain the same. Higher concentration of reactant will produce a higher concentration of product.
Lavelle mentioned in lecture that if more reactant is added to a chemical reaction at equilibrium more product will form until the original product to reactant ratio is maintained. The same is true for when more product is added at equilibrium which causes more reactant to form until the product to reactant ratio remains the same. This demonstrates Le Chatelier's Principle, which shows that K does not change because the chemical reaction adjusts to ensure that the product to reactant ratio remains the same whether more product or reactant is added.
Because of Le Chatelier's Principle. the reaction will adjust in order to keep the ratio of products to reactants the same. For example, if there's a higher concentration of reactants, the reaction will adjust to have a higher concentration of products. The actual concentrations will change, but the ratio will not.
According to Le Chatelier's Principle, an equilibrium will act to minimize external disturbances. So, if you increase the concentration of (let's say) the product, the equailibriım will start relying more on to the left side to produce more reactants. This will diminish the change done to the system as the ratios of the concentrations, and so the K value, will be the same.
This is true because of LeChatelier's principle that a reaction will try to minimize change to equilibrium. If more reactants are added the reaction shifts towards the products producing more product in the same ration that K was initially.
K tells us the ratio of concentrations between products and reactants that is most favorable given the current conditions. So, with changing concentrations, you will be changing your Q. Then, the reaction will work to bring Q towards K. The total amount of product and reactant will change, but their ratio will not.
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