( ( the precursor ) ( thus ( ( becomes ( more ( exposed ( to ( ( the ( basic solution ) ) ( that ( creates ( more surfactant ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT the) (NN precursor)) (ADVP (RB thus)) (VP (VBZ becomes) (ADJP (RBR more) (VBN exposed) (PP (TO to) (NP (NP (DT the) (JJ basic) (NN solution)) (SBAR (WHNP (WDT that)) (S (VP (VBZ creates) (ADJP (RBR more) (JJ surfactant))))))))) (. .)))
the precursor thus becomes more exposed to the basic solution that creates more surfactant.
(ROOT (S (PP (IN As) (NP (NN ph) (NNS increases))) (, ,) (NP (DT a) (NN solution)) (VP (VBZ becomes) (ADJP (RBR more) (JJ basic))) (. .)))