( ( ( pH indicators ) ( are ( substances ( obtained ( from ( ( plant material ) ( that ( ( change color ) ( depending ( on ( ( the degree ) ( of ( ( ( acid or ) base ) ( of ( the substance ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ( it ( ( is ( mixed with ) ) . ) ) )
(ROOT (S (S (NP (NN pH) (NNS indicators)) (VP (VBP are) (NP (NP (NNS substances)) (VP (VBN obtained) (PP (IN from) (NP (NP (NN plant) (NN material)) (SBAR (WHNP (WDT that)) (S (VP (VBP change) (NP (NN color)) (PP (VBG depending) (PP (IN on) (NP (NP (DT the) (NN degree)) (PP (IN of) (NP (NP (NN acid) (CC or) (NN base)) (PP (IN of) (NP (DT the) (NN substance))))))))))))))))) (NP (PRP it)) (VP (VBZ is) (ADJP (JJ mixed) (PP (IN with)))) (. .)))
pH indicators are substances obtained from plant material that change color depending on the degree of acid or base of the substance it is mixed with.
(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.