( ( ( Vocabulary ( acid ( anthocyanin ( base ( chemical ( change ( indicator pH ) ) ) ) ) ) ) ( In theory ) ) ( , ( ( ( any substance ) ( that ( undergoes ( a ( reversible chemical ) ) ) ) ) ( ( change ( when ( ( pH changes ) ( can ( be ( used ( as ( an ( acid-base indicator ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (NP (JJ Vocabulary) (NN acid) (NN anthocyanin) (NN base) (NN chemical) (NN change) (NN indicator) (NN pH)) (IN In) (NP (NN theory))) (, ,) (NP (NP (DT any) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ undergoes) (NP (DT a) (JJ reversible) (NN chemical)))))) (VP (VBP change) (SBAR (WHADVP (WRB when)) (S (NP (NN pH) (NNS changes)) (VP (MD can) (VP (VB be) (VP (VBN used) (PP (IN as) (NP (DT an) (JJ acid-base) (NN indicator))))))))) (. .)))
Vocabulary acid anthocyanin base chemical change indicator pH In theory, any substance that undergoes a reversible chemical change when pH changes can be used as an acid-base indicator.
(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.