( ( ( ( ( ( At ( ( pH values ) ( below 7 ) ) ) ( we ( have ( excess acid ) ) ) ) , ) and ) ( ( at ( ( pH levels ) ( above 7 ) ) ) ( we ( have ( ( excess base ) ( in ( the water ) ) ) ) ) ) ) . )
(ROOT (S (S (PP (IN At) (NP (NP (NN pH) (NNS values)) (PP (IN below) (NP (CD 7))))) (NP (PRP we)) (VP (VBP have) (NP (JJ excess) (NN acid)))) (, ,) (CC and) (S (PP (IN at) (NP (NP (NN pH) (NNS levels)) (PP (IN above) (NP (CD 7))))) (NP (PRP we)) (VP (VBP have) (NP (NP (JJ excess) (NN base)) (PP (IN in) (NP (DT the) (NN water)))))) (. .)))
At pH values below 7 we have excess acid, and at pH levels above 7 we have excess base in the water.
(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.