( ( pH 7 ) ( ( ( ( is neutral ) , ) ( like ( pure water ) ) ) . ) )
(ROOT (S (NP (NN pH) (CD 7)) (VP (VBZ is) (ADJP (JJ neutral)) (, ,) (PP (IN like) (NP (JJ pure) (NN water)))) (. .)))
pH 7 is neutral, like pure water.
(ROOT (S (NP (CD 7)) (VP (VBZ is) (NP (NP (DT the) (NN ph)) (PP (IN of) (NP (JJ pure) (NN water))))) (. .)))