If at equilibrium
there are significant amounts of both product and
reactants, then the reaction can be described in
terms of a K value, or equilibrium
constant. For any reaction:
aA + bB — cC + dD
the Keq is defined
as:
Keq = [C]c [D]d
[A]a [B]b
Note: The value
of the equilibrium constant may be determined
from experimental data if the
concentrations of both the reactants and
the products are known.