( ( ( ( ( ( ( ( The value ) ( of 7 ) ) ( is neutral ) ) , ) ( acids ( have ( pH ( values ( less ( than 7 ) ) ) ) ) ) ) and ) ( bases ( ( ( have ( pH values ) ) higher ) ( than 7 ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN value)) (PP (IN of) (NP (CD 7)))) (VP (VBZ is) (ADJP (JJ neutral)))) (, ,) (S (NP (NNS acids)) (VP (VBP have) (NP (CD pH) (NNS values) (QP (JJR less) (IN than) (CD 7))))) (CC and) (S (NP (NNS bases)) (VP (VBP have) (NP (NN pH) (NNS values)) (ADVP (RBR higher)) (PP (IN than) (NP (CD 7))))) (. .)))
The value of 7 is neutral, acids have pH values less than 7 and bases have pH values higher than 7.
(ROOT (S (NP (DT The) (NN ph) (NN scale)) (VP (VP (VBZ measures) (NP (NNS acids) (CC and) (NNS bases))) (CC and) (VP (VBZ has) (NP (NP (CD 7)) (PP (IN as) (NP (DT a) (JJ neutral) (NN value)))))) (. .)))
The ph scale measures acids and bases and has 7 as a neutral value.