MgCl_(2).6H_(2)Ocannot be dehydrated on strong heating .Why?

1.	MgCl_(2).6H_(2)Ocannot be dehydrated on strong heating .Why?
Answer» Solution :`MgCl_(2).6H_(2)O` has SIX WATER molecules andthe wateris called water of crystallisation .On HEATING it loses found fourwater molecules . `MgCl_(2).6H_(2)O overset ("heat") toMgCl_(2).2H_(2)O+4H_(2)O` water in `MgCl_(2).2H_(2)O` is called lattice water . On heating , lattice water reacts with mahnesium chloride/It UNDERGOES HYDROLYSIS and forms refractory magnesia . Therefore `MgCl_(2).2H_(2)O` is heated in the presence of dry HCl, to prevent possible hydrolysis.

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