For example, ammonia (NH) is soluble in both water (aq) and the organic solvent trichloromethane (CHCl) - two immiscible solvents.  If ammonia is first dissolved in water, and then an equal volume of trichloromethane is added, and the two liquids shaken together, the following equilibrium is established:
:K = [NH ]/[NH]        (where K is the equilibrium constant)
The equilibrium concentrations of ammonia in each layer can be established by titration with standard acid solution. It can thus be determined that K remains constant, with a value of 0.4 in this case.