( ( ( The pH ) ( of ( a solution ) ) ) ( ( is ( ( a measure ) ( of ( ( its degree ) ( of ( ( acidity or ) basicity ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN pH)) (PP (IN of) (NP (DT a) (NN solution)))) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (PRP$ its) (NN degree)) (PP (IN of) (NP (NN acidity) (CC or) (NN basicity))))))) (. .)))
The pH of a solution is a measure of its degree of acidity or basicity.
(ROOT (S (NP (NP (DT The) (NN acidity)) (PP (IN of) (NP (DT a) (NN solution)))) (VP (VBZ is) (ADVP (RB typically)) (VP (VBN assessed) (ADVP (RB experimentally)) (PP (IN by) (NP (NP (NN measurement)) (PP (IN of) (NP (PRP$ its) (NN ph.)))))))))