( ( ( 2 pH ) ( The pH ) ) ( ( is ( ( a measure ) ( of ( ( the concentration ) ( of ( hydrogen ions ) ) ) ) ) ) . ) )
(ROOT (S (NP (QP (CD 2) (CD pH)) (DT The) (NN pH)) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN concentration)) (PP (IN of) (NP (NN hydrogen) (NNS ions))))))) (. .)))
2 pH The pH is a measure of the concentration of hydrogen ions.
(ROOT (S (NP (NP (DT The) (NN concentration)) (PP (IN of) (NP (NP (DT the) (NN hydrogen) (NN ion)) (PP (IN in) (NP (DT a) (NN solution)))))) (VP (MD can) (VP (VB be) (VP (VBN calculated) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN ph)) (VP (VBZ is) (VP (VBN known)))))))) (. .)))
The concentration of the hydrogen ion in a solution can be calculated when the ph is known.