( ( On ( ( ( the ( pH scale ) ) , ) ( which ( varies ( from 0-14 ) ) ) ) ) ( , ( ( ( ( ( ( ( ( a ( ( very acidic ) solution ) ) ( has ( a ( low ( pH value ) ) ) ) ) , ) ( ( a ( ( very basic ) solution ) ) ( has ( a ( high ( pH value ) ) ) ) ) ) , ) and ) ( ( a ( neutral solution ) ) ( has ( ( a pH ) ( of ( approximately 7 ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN On) (NP (NP (DT the) (NN pH) (NN scale)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ varies) (PP (IN from) (NP (CD 0-14)))))))) (, ,) (S (NP (DT a) (ADJP (RB very) (JJ acidic)) (NN solution)) (VP (VBZ has) (NP (DT a) (JJ low) (NN pH) (NN value)))) (, ,) (S (NP (DT a) (ADJP (RB very) (JJ basic)) (NN solution)) (VP (VBZ has) (NP (DT a) (JJ high) (NN pH) (NN value)))) (, ,) (CC and) (S (NP (DT a) (JJ neutral) (NN solution)) (VP (VBZ has) (NP (NP (DT a) (NN pH)) (PP (IN of) (NP (QP (RB approximately) (CD 7))))))) (. .)))
On the pH scale, which varies from 0-14, a very acidic solution has a low pH value, a very basic solution has a high pH value, and a neutral solution has a pH of approximately 7.
(ROOT (S (NP (NNS Acids)) (VP (VBP are) (VP (VBN associated) (PP (IN with) (NP (NP (DT a) (JJ low) (NN number)) (PP (IN on) (NP (DT the) (NN ph) (NN scale))))))) (. .)))