( ( Sodium arsenite ) ( ( is ( ( used ( in ( the ( water ( gas ( shift reaction ) ) ) ) ) ) ( to ( remove ( carbon dioxide ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Sodium) (NNP arsenite)) (VP (VBZ is) (VP (VBN used) (PP (IN in) (NP (DT the) (NN water) (NN gas) (NN shift) (NN reaction))) (S (VP (TO to) (VP (VB remove) (NP (NN carbon) (NN dioxide))))))) (. .)))
Sodium arsenite is used in the water gas shift reaction to remove carbon dioxide.
(ROOT (S (NP (NNP Combustion) (NNS reactions)) (VP (VBP involve) (S (NP (NP (DT the) (NN reaction)) (PP (IN of) (NP (NP (DT a) (NN hydrocarbon)) (PP (IN with) (NP (NN oxygen) (NN gas)))))) (VP (TO to) (VP (VB produce) (NP (NN water) (CC and) (NN carbon) (NN dioxide)))))) (. .)))