( ( pH ( of 7 ) ) ( ( represents ( ( neutrality ( -LRB- ( ( pure water ) -RRB- ) ) ) ( at ( ( 20 & ) deg ) ) ) ) ; ) )
(ROOT (S (NP (NP (NN pH)) (PP (IN of) (NP (CD 7)))) (VP (VBZ represents) (NP (NP (NP (NN neutrality)) (PRN (-LRB- -LRB-) (NP (JJ pure) (NN water)) (-RRB- -RRB-))) (PP (IN at) (NP (NNP 20) (CC &) (NNP deg))))) (: ;)))
pH of 7 represents neutrality (pure water) at 20&deg;
(ROOT (S (NP (CD 7)) (VP (VBZ is) (NP (NP (DT the) (NN ph)) (PP (IN of) (NP (JJ pure) (NN water))))) (. .)))