( ( In aqueous ) ( ( solution water ) ( ( is ( the solvent ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (NNS aqueous))) (NP (NN solution) (NN water)) (VP (VBZ is) (NP (DT the) (JJ solvent))) (. .)))
In aqueous solution water is the solvent.
(ROOT (S (NP (JJ Aqueous) (NN solution)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB describe) (NP (NP (DT a) (NN solution)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NN water)) (VP (VBZ is) (NP (DT the) (JJ solvent))))))))))) (. .)))