( pH ( ( Expresses ( ( the ( hydrogen ( ion concentration ) ) ) ( of ( ( ( the solution ) , ) ( ( the intensity ) ( of ( ( acidity or ) alkalinity ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN pH)) (VP (VBZ Expresses) (NP (NP (DT the) (NN hydrogen) (NN ion) (NN concentration)) (PP (IN of) (NP (NP (DT the) (NN solution)) (, ,) (NP (NP (DT the) (NN intensity)) (PP (IN of) (NP (NN acidity) (CC or) (NN alkalinity)))))))) (. .)))
pH Expresses the hydrogen ion concentration of the solution, the intensity of acidity or alkalinity.
(ROOT (S (NP (NP (DT The) (NN concentration)) (PP (IN of) (NP (NP (NN hydrogen) (NNS ions)) (PP (IN in) (NP (DT a) (NN solution)))))) (VP (VBZ is) (VP (VBN called) (ADVP (RB acidity)))) (. .)))