( ( ( Acids , ) ( ( Bases and ) ( the ( pH Scale ) ) ) ) - )
(ROOT (NP (NP (NNS Acids)) (, ,) (NP (NP (NNP Bases)) (CC and) (NP (DT the) (NNP pH) (NNP Scale))) (: -)))
Acids, Bases and the pH Scale -
(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))))))) (. .)))