If {TAIL ~ a hydrate} of the metal hydroxide is employed as the starting material, it is generally preferred to remove {HEAD ~ the water} of hydration initially by adding the inert solvent and heating the resulting mixture to the boiling point of the solvent for the period of time required to distill off the water of hydration, typically from 0.5 to 3.0 hours 
If { TAIL ~ a hydrate } of the metal hydroxide is employed as the starting material , it is generally preferred to remove { HEAD ~ the water } of hydration initially by adding the inert solvent and heating the resulting mixture to the boiling point of the solvent for the period of time required to distill off the water of hydration , typically from 0.5 to 3.0 hours
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH