( ( ( ( A pH ) ( of ( 7-7 .9 ) ) ) ( is neutral ) ) ( , ( ( ( an example ) ( of this ) ) ( ( is water ) . ) ) ) )
(ROOT (S (S (NP (NP (DT A) (NN pH)) (PP (IN of) (NP (CD 7-7) (CD .9)))) (VP (VBZ is) (ADJP (JJ neutral)))) (, ,) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (DT this)))) (VP (VBZ is) (NP (NN water))) (. .)))
A pH of 7-7.9 is neutral, an example of this is water.
(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))))))) (. .)))