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If you know what the equilibrium constant of the reaction is, you can use it (plus some extra given info), to figure out the individual equilibrium concentrations of products and reactants. Hope that answers your question!
Also, when a reaction is said to be at equilibrium, it means that the products and reactants are being produced at the same rate. A chemical reaction at equilibrium represents a fixed P/R=K ratio. K is independent of concentration which means it will not change when there is more of one product or reactant.
If you know the equilibrium reaction and the value of Keq for that reaction, you can figure out which way the reaction is moving when given any concentrations in that reaction. Just plug those non-eq values into the Keq equation and if your value is less than the Keq the reaction is moving toward the products and if it is larger the reaction is moving toward the reactants.
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