( ( ( A pH ) ( of 7 ) ) ( ( means ( that ( ( the water ) ( is neutral ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN pH)) (PP (IN of) (NP (CD 7)))) (VP (VBZ means) (SBAR (IN that) (S (NP (DT the) (NN water)) (VP (VBZ is) (ADJP (JJ neutral)))))) (. .)))
A pH of 7 means that the water is neutral.
(ROOT (S (NP (NNP Water)) (VP (VBZ is) (PP (IN at) (NP (NP (DT the) (NN neutrality)) (, ,) (NP (NP (CD 7) (NN point)) (PP (IN on) (NP (DT the) (NN ph) (NN scale))))))) (. .)))