( They ( are ( red ( in ( acidic ( solutions ( -LRB- pH ) ) ) ) ) ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (ADJP (JJ red) (PP (IN in) (NP (NP (JJ acidic)) (NP (NNP solutions) (-LRB- -LRB-) (NNP pH))))))))
They are red in acidic solutions (pH
(ROOT (S (NP (NP (DT The) (NN acidity)) (PP (IN of) (NP (DT a) (NN solution)))) (VP (VBZ is) (ADVP (RB typically)) (VP (VBN assessed) (ADVP (RB experimentally)) (PP (IN by) (NP (NP (NN measurement)) (PP (IN of) (NP (PRP$ its) (NN ph.)))))))))