( ( ( A substance ) ( with ( ( a pH ) ( of 7 ) ) ) ) ( ( ( ( is neutral ) , ) ( meaning ( that ( it ( ( is not ) ( ( ( an acid ) or ) ( a base ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN substance)) (PP (IN with) (NP (NP (DT a) (NN pH)) (PP (IN of) (NP (CD 7)))))) (VP (VBZ is) (ADJP (JJ neutral))) (, ,) (VP (VBG meaning) (SBAR (IN that) (S (NP (PRP it)) (VP (VBZ is) (RB not) (NP (NP (DT an) (NN acid)) (CC or) (NP (DT a) (NN base))))))) (. .)))
A substance with a pH of 7 is neutral, meaning that it is not an acid or a base.
(ROOT (S (NP (PRP You)) (VP (VBP call) (S (NP (NP (DT a) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (RB not) (NP (NP (DT an) (NN acid)) (CC or) (NP (DT a) (NN base))))))) (ADJP (JJ neutral)))) (. .)))