( ( 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 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.