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