( ( pH ( ( A ( logarithmic measure ) ) ( of ( ( the ( ( acidity or ) alkalinity ) ) ( of ( ( a solution ) ( using ( the ( hydrogen ( ion concentration ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB pH) (NP (NP (DT A) (JJ logarithmic) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN acidity) (CC or) (NN alkalinity)) (PP (IN of) (NP (NP (DT a) (NN solution)) (VP (VBG using) (NP (DT the) (NN hydrogen) (NN ion) (NN concentration))))))))) (. .)))
pH A logarithmic measure of the acidity or alkalinity of a solution using the hydrogen ion concentration.
(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.)))))))))