( ( ( ( ( ( The ( equivalence point ) ) ( ( may not ) ( occur ( at ( ( ( pH 7 ) , ) ( neutral pH ) ) ) ) ) ) , ) so ) ( ( the ( appropriate ( pH indicator ) ) ) ( must ( be ( chosen ( for ( ( ( the type ) ( of ( ( acid and ) base ) ) ) ( being titrated ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (JJ equivalence) (NN point)) (VP (MD may) (RB not) (VP (VB occur) (PP (IN at) (NP (NP (NN pH) (CD 7)) (, ,) (NP (JJ neutral) (NN pH))))))) (, ,) (IN so) (S (NP (DT the) (JJ appropriate) (NN pH) (NN indicator)) (VP (MD must) (VP (VB be) (VP (VBN chosen) (PP (IN for) (NP (NP (DT the) (NN type)) (PP (IN of) (NP (NN acid) (CC and) (NN base))) (VP (VBG being) (VP (VBN titrated))))))))) (. .)))
The equivalence point may not occur at pH 7, neutral pH, so the appropriate pH indicator must be chosen for the type of acid and base being titrated.
(ROOT (S (SBAR (IN If) (S (NP (DT a) (NN substance)) (VP (VBZ has) (NP (DT a) (NN ph) (NN value)) (NP (QP (JJR greater) (IN than) (CD 7)))))) (, ,) (NP (DT that)) (VP (VBZ indicates) (SBAR (IN that) (S (NP (PRP it)) (VP (VBZ is) (NP (NN base)))))) (. .)))
If a substance has a ph value greater than 7,that indicates that it is base.