( ( If ( ( ( the ( hydrogen ( ion concentration ) ) ) ( of ( a solution ) ) ) increases ) ) ( , ( ( ( ( ( ( as ( happens ( with ( increasing acidity ) ) ) ) ( , ( ( the pH ) ( will decrease ) ) ) ) , ) and ) ( vice versa ) ) . ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NP (DT the) (NN hydrogen) (NN ion) (NN concentration)) (PP (IN of) (NP (DT a) (NN solution)))) (VP (VBZ increases)))) (, ,) (S (SBAR (IN as) (S (VP (VBZ happens) (PP (IN with) (S (VP (VBG increasing) (ADVP (RB acidity)))))))) (, ,) (NP (DT the) (NN pH)) (VP (MD will) (VP (VB decrease)))) (, ,) (CC and) (ADVP (RB vice) (RB versa)) (. .)))
If the hydrogen ion concentration of a solution increases, as happens with increasing acidity, the pH will decrease, and vice versa.
(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)))) (. .)))