Why should a magnesium ribbon be cleaned before burning in air?
Answers
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Why should a magnesium ribbon be cleaned before burning in air?
Solution:
Magnesium ribbon should be cleaned before burning in air because Magnesium metal reacts with the atmospheric oxygen and forms Magnesium Oxide (MgO) layer which is a very stable compound. In order to prevent further reactions with Oxygen, it is therefore necessary to clean the ribbon by to remove the layer of MgO.
Magnesium is a very reactive metal. So, when it is stored, it reacts with oxygen in the presence of air to form a layer of magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. Therefor, magnesium ribbon is cleaned in order to remove the layer of magnesium oxide so that it can burn in air.