( ( Fractional precipitation ) ( ( Separates ( on ( ( the basis ) ( of solubility ) ) ) ) . ) )
(ROOT (S (NP (JJ Fractional) (NN precipitation)) (VP (VBZ Separates) (PP (IN on) (NP (NP (DT the) (NN basis)) (PP (IN of) (NP (NN solubility)))))) (. .)))
Fractional precipitation Separates on the basis of solubility.
(ROOT (S (NP (JJ Fractional) (NN crystallization)) (VP (VBZ is) (NP (NP (DT the) (NN separation)) (PP (IN of) (NP (NP (NNS compounds)) (PP (IN on) (NP (NP (DT the) (NN basis)) (PP (IN of) (NP (PRP$ their) (NNS solubilities))))))) (PP (IN in) (NP (DT a) (VBN given) (NN solvent))))) (. .)))