( pH ( ( ( is simply ) ( ( a scale ) ( that ( measures ( ( the ( ( acidity and ) alkalinity ) ) ( of ( water solution ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN pH)) (VP (VBZ is) (ADVP (RB simply)) (NP (NP (DT a) (NN scale)) (SBAR (WHNP (WDT that)) (S (VP (VBZ measures) (NP (NP (DT the) (NN acidity) (CC and) (NN alkalinity)) (PP (IN of) (NP (NN water) (NN solution))))))))) (. .)))
pH is simply a scale that measures the acidity and alkalinity of water solution.
(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))))))))) (. .)))