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K is essentially the reaction quotient at equilibrium. The reaction quotient can be used to determine if there are more products or reactants present in relation to equilibrium. If K is found to be greater than Q, then there are more products relative to reactants at equilibrium. If K is found to be smaller than Q, then there are more reactants relative to products at equilibrium.
Q and K represent the same kind of value, but they're used at different times. K is the equilibrium constant, meaning it represents the ratio of products to reactants at equilibrium. Q is the reaction quotient, meaning it represents the ratio of products to reactants at some other point, not necessarily at equilibrium.
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