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