What's the simplest and safest DIY way to obtain magnesium hydroxide to magnesium oxide?
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Magnesium hydroxide decomposes at 332 °C (630 °F) :
$$\ce{Mg(OH)2_{(s)} -> MgO_{(s)} + H2O_{(g) }}$$
So heat the magnesium hydroxide in a covered crucible. The released water will cause the particles of magnesium hydroxide to "explode" so you want to do this covered.
