( ( In ( the ( eighteenth century ) ) ) ( it ( ( was ( recognized ( that ( acids ( ( ( have ( a ( sour taste ) ) ) , ) ( ( ( ( that ( they ( react ( with ( limestone ( producing ( ( a ( gaseous substance ) ) ( -LRB- ( ( CO 2 ) -RRB- ) ) ) ) ) ) ) ) ) , ) and ) ( that ( ( neutral substances ) ( ( result ( from ( their interaction ) ) ) ( with bases ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (JJ eighteenth) (NN century))) (NP (PRP it)) (VP (VBD was) (VP (VBN recognized) (SBAR (IN that) (S (NP (NNS acids)) (VP (VBP have) (NP (DT a) (JJ sour) (NN taste)) (, ,) (SBAR (SBAR (IN that) (S (NP (PRP they)) (VP (VBP react) (PP (IN with) (NP (NP (NN limestone)) (VP (VBG producing) (NP (NP (DT a) (JJ gaseous) (NN substance)) (PRN (-LRB- -LRB-) (NP (QP (CD CO) (CD 2))) (-RRB- -RRB-))))))))) (, ,) (CC and) (SBAR (IN that) (S (NP (JJ neutral) (NNS substances)) (VP (VBP result) (PP (IN from) (NP (PRP$ their) (NN interaction))) (PP (IN with) (NP (NNS bases)))))))))))) (. .)))
In the eighteenth century it was recognized that acids have a sour taste, that they react with limestone producing a gaseous substance (CO 2 ), and that neutral substances result from their interaction with bases.
(ROOT (S (NP (PRP You)) (VP (VBP call) (S (NP (NP (DT a) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (RB not) (NP (NP (DT an) (NN acid)) (CC or) (NP (DT a) (NN base))))))) (ADJP (JJ neutral)))) (. .)))