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