The solution is poured in {HEAD ~ a reactor} and stirred to get {TAIL ~ a homogeneous mixture} 
The solution is poured in { HEAD ~ a reactor } and stirred to get { TAIL ~ a homogeneous mixture }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL