Homogeneous equilibrium

In a homogeneous equilibrium, every reactant and every product is present in the very same phase. For instance, in

all three species -- $H_2$, $I_2$ and $HI$ -- are gases, so the whole equilibrium sits in a single (gaseous) phase. Homogeneous equilibrium is not limited to gases: the ester hydrolysis reaction

$CH_3COOCH_3(aq) + H_2O(aq) \rightleftharpoons CH_3COOH(aq) + CH_3OH(aq)$ …