( ( ( The pH ) ( of ( pure water ) ) ) ( ( is ( ( 7 , ) ( which ( is ( a neutral ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN pH)) (PP (IN of) (NP (JJ pure) (NN water)))) (VP (VBZ is) (NP (NP (CD 7)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (DT a) (JJ neutral))))))) (. .)))
The pH of pure water is 7, which is a neutral.
(ROOT (S (NP (CD 7)) (VP (VBZ is) (NP (NP (DT the) (NN ph)) (PP (IN of) (NP (JJ pure) (NN water))))) (. .)))