( Students ( ( learn ( about ( ( ( ( ( acids , ) bases ) , ) and ) ( the ( pH scale ) ) ) ) ) ; ) )
(ROOT (S (NP (NNS Students)) (VP (VBP learn) (PP (IN about) (NP (NP (NNS acids)) (, ,) (NP (NNS bases)) (, ,) (CC and) (NP (DT the) (NN pH) (NN scale))))) (: ;)))
Students learn about acids, bases, and the pH scale;
(ROOT (S (NP (NNS Acids)) (VP (VBP are) (VP (VBN associated) (PP (IN with) (NP (NP (DT a) (JJ low) (NN number)) (PP (IN on) (NP (DT the) (NN ph) (NN scale))))))) (. .)))