( ( As ( ( pH rises ) ( in ( a solution ) ) ) ) ( , ( ( the conditions ) ( ( become ( ( ( more and ) more ) acidic ) ) . ) ) ) )
(ROOT (S (PP (IN As) (NP (NP (NN pH) (NNS rises)) (PP (IN in) (NP (DT a) (NN solution))))) (, ,) (NP (DT the) (NNS conditions)) (VP (VBP become) (ADJP (ADVP (RBR more) (CC and) (RBR more)) (JJ acidic))) (. .)))
As pH rises in a solution, the conditions become more and more acidic.
(ROOT (S (PP (IN As) (NP (NN ph) (NNS increases))) (, ,) (NP (DT a) (NN solution)) (VP (VBZ becomes) (ADJP (RBR more) (JJ basic))) (. .)))