( ( HCl gas ) ( ( ( is then ) ( bubbled ( into ( ( ( ( 100ml ( of water ) ) , ) and ) ( 100ml ( of toluene ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP HCl) (NN gas)) (VP (VBZ is) (ADVP (RB then)) (VP (VBN bubbled) (PP (IN into) (NP (NP (NP (NNS 100ml)) (PP (IN of) (NP (NN water)))) (, ,) (CC and) (NP (NP (NNS 100ml)) (PP (IN of) (NP (NN toluene)))))))) (. .)))
HCl gas is then bubbled into 100ml of water, and 100ml of toluene.
(ROOT (S (NP (NNP Gas) (NN bubble) (NNS holes)) (VP (VBZ helps) (NP (NP (JJ pumice) (NN float)) (PP (IN in) (NP (NN water))))) (. .)))