Preferably, {HEAD ~ the metal} of {TAIL ~ the water soluble salt} will be multivalent, i.e., it will have a valence greater than 1 
Preferably , { HEAD ~ the metal } of { TAIL ~ the water soluble salt } will be multivalent , i.e. , it will have a valence greater than 1
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH