One phase, amounting to 0.5 5.0 parts per 100 parts of the other phase, consists of an aqueous solution of sodium hydroxide {HEAD ~ whose concentration} is in {TAIL ~ the range} of 25 to 55 percent by weight 
is in
One phase , amounting to 0.5 5.0 parts per 100 parts of the other phase , consists of an aqueous solution of sodium hydroxide { HEAD ~ whose concentration } is in { TAIL ~ the range } of 25 to 55 percent by weight
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH