where K is a constant for
the reaction at constant temperature. (Note: K has no units. )
Keq = [C]c [D]d [A]a [B]bThe concentrations at
equilibrium always combine in the manner below where the products are in the numerator and the reactants are in the denominator to produce the K value, regardless of the
initial concentrations of species.*
Equilibrium
Constant, Keq
*What
if the reaction were going in the reverse direction? How would it affect K?