Question

why should a magnesium ribbon be cleaned before burning in air? ​

Answer 1

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Magnesium ribbon must be cleaned before burning in air so that the layer of magnesium oxide (which is formed due to reaction of magnesium with air) can be removed in order to get the desired chemical reaction.

Before burning in air, the magnesium ribbon is cleaned by rubbing with sandpaper. This is done to remove the protective layer of basic magnesium carbonate ( Mg(CO3)2) from the surface of ribbon.

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Answer 2

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Magnesium is very reactive metal. When stored in reacts with oxygen to form a later magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air.

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