( ( an ( aqueous solution ) ) ( ( is ( made ( by ( ( using water ) ( as ( a solvent ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT an) (NNS aqueous) (NN solution)) (VP (VBZ is) (VP (VBN made) (PP (IN by) (S (VP (VBG using) (NP (NN water)) (PP (IN as) (NP (DT a) (JJ solvent)))))))) (. .)))
an aqueous solution is made by using water as a 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))))))))))) (. .)))