Definitions for "Equilibrium constant"
(K, Keq) equilibrium constant expression; law of mass action. Compare with reaction quotient. The product of the concentrations of the products, divided by the product of the concentrations of the reactants, for a chemical reaction at equilibrium. For example, the equilibrium constant for A + B = C + D is equal to [C][D] / ([A][B]), where the square brackets indicate equilibrium concentrations. Each concentration is raised to a power equal to its stoichiometric coefficient in the expression. The equilibrium constant for A + 2B = 3C is equal to [C]3/([A][B]2). For gas phase reactions, partial pressures can be used in the equilibrium constant expression in place of concentrations.
the ratio of concentrations of products to reactants for a reaction at chemical equilibrium.
Ratio of forward and reverse rate constants for a reaction. For a binding reaction, A + B 1 2 AB, it equals the association constant, a; the higher the a, the tighter the binding between A and B. The reciprocal of the a is the dissociation constant, D; the higher the D, the weaker the binding between A and B.