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Explain why hydrated magnesium chloride ...

Explain why hydrated magnesium chloride can not be dehydrated upon heating.

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The Formula of the hydrated salt is `MgCI_(2).6H_(2)O`. When heated, it gets hydrolysed to form MgO
`MgCI_(2).6H_(2)O overset("Heat")(to) MgO + 2HCI + 5H_(2)O`
Therefore, the salt cannot be dehydrated by heating as such. The dehydration is done by passing HCI gas through the hydrated salt at about 650 K.
`MgCI_(2).6H_(2)O underset(650K)(HCI(g))(to) underset(("Anhydrous"))(MgCI_(2) + 6H_(2)O)`
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