( ( A ( DEFINITION Acidity ) ) ( ( is ( ( ( measured ( using ( a ( pH scale ) ) ) ) , ) ( with ( ( the ( number 7 ) ) ( being neutral ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NNP DEFINITION) (NNP Acidity)) (VP (VBZ is) (VP (VBN measured) (S (VP (VBG using) (NP (DT a) (NN pH) (NN scale)))) (, ,) (PP (IN with) (NP (NP (DT the) (NN number) (CD 7)) (VP (VBG being) (ADJP (JJ neutral))))))) (. .)))
A DEFINITION Acidity is measured using a pH scale, with the number 7 being neutral.
(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))))))) (. .)))