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Does magnesium oxide dissociates when it is heated?
Question Date: 2013-04-14
Answer 1:

Yes, magnesium oxide (MgO) will eventually dissociate when it is heated, but not until very high temperatures. In fact, MgO, like other ionic compounds, does not dissociate appreciably until it melts. The melting point of MgO is 2827°C, which is very high – almost as high as the melting point of iron. In molten MgO, the Mg2+ and O2- ions can move freely and conduct electricity. If MgO is heated even hotter to its boiling point at 3600°C, it can dissociate in the gas phase into gaseous ions.

http://en.wikipedia.org/wiki/Magnesium_oxide Wriedt, H.A. “The Mg−O (Magnesium-Oxygen) system.” Bulletin of Alloy Phase Diagrams 1987, 8, 3, 227-233.

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