The ratio of the solubilities called the partition coefficient, KD = C2 / C1, in this experiment is defined as an [organic]/[water] equilibrium constant-the concentration of solute in the organic phase is in the numerator of the KD expression and the concentration of solute in the aqueous phase is in the denominator. For this liquid-liquid extraction, how would the chemical equation for the equilibrium be written to correctly show the solute being distributed between the two phases?