( ( pH ( In chemistry ) ) ( , ( pH ( ( is ( ( a measure ) ( of ( ( the concentration ) ( of ( ( hydrogen ions ) ( in ( ( ( a solution ) , ) ( which ( is ( ( a measure ) ( of ( ( acidity or ) alkalinity ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (ADVP (RB pH)) (IN In) (NP (NN chemistry))) (, ,) (NP (NN pH)) (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (NN concentration)) (PP (IN of) (NP (NP (NN hydrogen) (NNS ions)) (PP (IN in) (NP (NP (DT a) (NN solution)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NN acidity) (CC or) (NN alkalinity))))))))))))))) (. .)))
pH In chemistry, pH is a measure of the concentration of hydrogen ions in a solution, which is a measure of acidity or alkalinity.
(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.