Hydrated magnesium chloride cannot be dehydrated by heating.

1.	Hydrated magnesium chloride cannot be dehydrated by heating.
Answer» SOLUTION :The formula of the HYDRATED salt is `MgCl_(2).6H_(2)O`. When heated, it gets hydrolysed to form MgO. `MgCl_(2).6H_(2)O overset("Heat")(to) MgO + 2HCl + 5H_(2)O` Therefore, the salt cannot be DEHYDRATED by HEATING as such. The dehydration is done by passing HCl gas through the hydrated salt at about 650 K. `MgCl_(2).6H_(2)O underset(650K)overset(HCl(g))(to) underset("Anhydrous")(MgCl_(2)) + 6H_(2)O`

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