The equilibrium constant (Kc) describes the relationship between what at equilibrium?

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Multiple Choice

The equilibrium constant (Kc) describes the relationship between what at equilibrium?

At a given temperature, the equilibrium constant tells you the ratio of the concentrations of products to reactants at equilibrium, each raised to their stoichiometric powers. It stays the same regardless of how the mixture was started, because it reflects the balance reached when the forward and reverse rates are equal. The initial concentrations don’t fix this ratio; they merely influence how far the reaction must proceed to reach equilibrium. Total pressure matters for gas-phase reactions in a related way (through Kp and its relation to Kc via Kp = Kc(RT)^Δn), but Kc itself specifically describes the equilibrium concentrations, not the rates or the starting amounts.

At a given temperature, the equilibrium constant tells you the ratio of the concentrations of products to reactants at equilibrium, each raised to their stoichiometric powers. It stays the same regardless of how the mixture was started, because it reflects the balance reached when the forward and reverse rates are equal. The initial concentrations don’t fix this ratio; they merely influence how far the reaction must proceed to reach equilibrium. Total pressure matters for gas-phase reactions in a related way (through Kp and its relation to Kc via Kp = Kc(RT)^Δn), but Kc itself specifically describes the equilibrium concentrations, not the rates or the starting amounts.

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