( Solubility ( , ( ( ( ( ( acid-base equilibria ) , ) ( the ( pH scale ) ) ) , ) ( buffers . ) ) ) )
(ROOT (S (ADVP (RB Solubility)) (, ,) (NP (NP (JJ acid-base) (NN equilibria)) (, ,) (NP (DT the) (NN pH) (NN scale)) (, ,)) (VP (VBZ buffers)) (. .)))
Solubility, acid-base equilibria, the pH scale, buffers.
(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))))))) (. .)))