Generally, if pH of scrubbing liquor falls below a range of 5.0 to 6.0, additional reagent is required to maintain the reactivity of the absorbent.
( Generally ( , ( ( if ( ( pH ( of ( scrubbing liquor ) ) ) ( falls ( below ( ( a range ) ( of ( 5.0 ( to 6.0 ) ) ) ) ) ) ) ) ( , ( ( additional reagent ) ( ( is ( required ( to ( maintain ( ( the reactivity ) ( of ( the absorbent ) ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (ADVP (RB Generally)) (, ,) (SBAR (IN if) (S (NP (NP (NN pH)) (PP (IN of) (NP (JJ scrubbing) (NN liquor)))) (VP (VBZ falls) (PP (IN below) (NP (NP (DT a) (NN range)) (PP (IN of) (NP (CD 5.0) (TO to) (CD 6.0)))))))) (, ,) (NP (JJ additional) (NN reagent)) (VP (VBZ is) (VP (VBN required) (S (VP (TO to) (VP (VB maintain) (NP (NP (DT the) (NN reactivity)) (PP (IN of) (NP (DT the) (NN absorbent))))))))) (. .)))
 if pH of scrubbing liquor falls below a range of 5.0 to 6.0, then the whole world may explode
( ( if ( ( pH ( of ( scrubbing liquor ) ) ) ( falls ( below ( ( a range ) ( of ( 5.0 ( to 6.0 ) ) ) ) ) ) ) ) ( , ( ( then ( the ( whole world ) ) ) ( may explode ) ) ) )
(ROOT (S (SBAR (IN if) (S (NP (NP (NN pH)) (PP (IN of) (NP (JJ scrubbing) (NN liquor)))) (VP (VBZ falls) (PP (IN below) (NP (NP (DT a) (NN range)) (PP (IN of) (NP (CD 5.0) (TO to) (CD 6.0)))))))) (, ,) (NP (RB then) (DT the) (JJ whole) (NN world)) (VP (MD may) (VP (VB explode)))))