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Why should a magnesium ribbon be cleaned...

Why should a magnesium ribbon be cleaned before burning in air?

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Magnesium is a very reactive metal like Na, Ca, etc.. When exposed to air it reacts with oxygen to forma layer of magnesium oxide (MgO) on its surface.
`2Mg + O_(2) to 2MgO`
This layer of magnesium oxide is pretty stable and prevents additional reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be used for the reaction.
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