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MgCl(2).6H(2)O cannot be dehydrated on ...

`MgCl_(2).6H_(2)O` cannot be dehydrated on strong heating .Why?

Text Solution

Verified by Experts

`MgCl_(2).6H_(2)O` has six water molecules and the water is called water of crystallisation .On heating it loses found four water 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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