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(ROOT (S (PP (IN In) (NP (NN chemistry))) (, ,) (NP (NN pH)) (VP (VBZ is) (NP (NP (DT a) (JJ logarithmic) (NN measure)) (PP (IN for) (NP (NP (DT the) (NN acidity)) (PP (IN of) (NP (DT an) (JJ aqueous) (NN solution))))))) (. .)))
In chemistry, pH is a logarithmic measure for the acidity of an aqueous solution.
(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.)))))))))