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Equilibrium Constant

K = [Products]/[Reactants], representing the ratio of products to reactants at equilibrium, influenced by catalytic effects.

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The statement of the theorem

For a general reversible reaction

aA + bB \rightleftharpoons cC + dD

, the equilibrium constant

K

is defined by the ratio of the activities (approximated by concentrations) of products to reactants at equilibrium:

K = \frac{[C]^c [D]^d}{[A]^a [B]^b}

where the activities are evaluated when the system reaches thermodynamic equilibrium.

Source: Wikipedia