( ( The ( pH scale ) ) ( ( measures ( how ( ( ( ( acidic or ) basic ) ( a substance ) ) is ) ) ) . ) )
(ROOT (S (NP (DT The) (NN pH) (NN scale)) (VP (VBZ measures) (SBAR (WHADVP (WRB how)) (S (NP (ADJP (JJ acidic) (CC or) (JJ basic)) (DT a) (NN substance)) (VP (VBZ is))))) (. .)))
The pH scale measures how acidic or basic a substance is.
(ROOT (S (NP (DT The) (NN ph) (NN scale)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (ADVP (RB succinctly)) (VB communicate) (NP (NP (DT the) (NN acidity) (CC or) (NN basicity)) (PP (IN of) (NP (DT a) (NN solution))))))))) (. .)))