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Background research

Question

Why doesn't magnesium hydroxide form when treated with hot steam, instead of magnesium oxide?

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There are two steps in the process:

$\ce{Mg + H2O -> MgO + H2}$

and

$\ce{MgO + H2O <-> Mg(OH)2}$

The equilibrium point in the second step is dependent on the temperature. See file Equilibrium Assemblages for more information.

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  • $\begingroup$ The chemical equation has to be balanced $\endgroup$ – Arvin Kushwaha Apr 19 '18 at 17:56
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$\ce{Mg(OH)2}$ decomposes at high temps into $\ce{MgO}$ and $\ce{H2O}$. To be exact, 350 C

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