where K is a constant
for the reaction at constant temperature. (Note: K has no units. )
Keq = [C]c [D]d
[A]a [B]b
The 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?