( Perchlorates ( ( ( should not ) ( be ( used ( ( ( as ( ( drying agents ) ( if ( there ( is ( ( any possibility ) ( of ( contact ( with ( organic compounds ) ) ) ) ) ) ) ) ) ) or ) ( of ( proximity ( to ( ( a ( dehydrating acid ) ) ( ( strong enough ) ( to ( concentrate ( ( the ( perchloric acid ) ) ( -LRB- ( ( ( e.g. , ) ( ( a ( drying train ) ) ( that ( ( has ( ( a bubble ) counter ) ) ( containing ( sulfuric acid ) ) ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Perchlorates)) (VP (MD should) (RB not) (VP (VB be) (VP (VBN used) (PP (PP (IN as) (S (VP (VBG drying) (NP (NNS agents)) (SBAR (IN if) (S (NP (EX there)) (VP (VBZ is) (NP (NP (DT any) (NN possibility)) (PP (IN of) (NP (NP (NN contact)) (PP (IN with) (NP (JJ organic) (NNS compounds)))))))))))) (CC or) (PP (IN of) (NP (NP (NN proximity)) (PP (TO to) (NP (NP (DT a) (VBG dehydrating) (NN acid)) (ADJP (JJ strong) (RB enough) (S (VP (TO to) (VP (VB concentrate) (NP (NP (DT the) (JJ perchloric) (NN acid)) (PRN (-LRB- -LRB-) (NP (NP (NNP e.g.)) (, ,) (NP (NP (DT a) (JJ drying) (NN train)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (ADVP (NP (DT a) (NN bubble)) (RB counter)) (S (VP (VBG containing) (NP (JJ sulfuric) (NN acid))))))))) (-RRB- -RRB-))))))))))))))) (. .)))
Perchlorates should not be used as drying agents if there is any possibility of contact with organic compounds or of proximity to a dehydrating acid strong enough to concentrate the perchloric acid (e.g., a drying train that has a bubble counter containing sulfuric acid).
(ROOT (S (NP (NP (DT The) (JJ strong) (NN affinity)) (PP (IN of) (NP (NP (VBN concentrated) (JJ sulfuric) (NN acid)) (PP (IN for) (NP (NN water)))))) (VP (VBZ makes) (S (NP (PRP it)) (NP (NP (DT a) (JJ good) (NN agent)) (PP (IN for) (NP (NN dehydrating)))))) (. .)))