Why should a magnesium ribbon can be cleaned before buring in air?
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Answer:
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Magnesium ribbon should be cleaned with sandpaper before burning in the air. ... To remove the Magnesium oxide layer from the ribbon which may prevent or slow down the burning of magnesium ribbon. Unwanted impurities deposited on the magnesium ribbon can be removed and only pure magnesium can be used for the reaction.
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Answer:
Explanation:
Complete step-by-step solution -
Let us see why it is important to clean the surface of the magnesium ribbon before burning it.
- Magnesium is an alkaline earth metal. Metals which are in the second group of the periodic table are called the alkaline earth metals. They are very reactive since they have just two electrons in their outer electron shell.
- This high reactive nature of magnesium is the reason why magnesium ribbons should be cleaned before using it.
- When we keep magnesium ribbon in contact with air for a long time, it reacts with the oxygen present in the air and the magnesium ribbon gets oxidised into magnesium oxide.
2Mg+O2⟶2MgO
- The oxide coating on the magnesium ribbon is formed on the surface of the ribbon and it turns the ribbon white. This coating hinders the burning of the ribbon as this layer does not burn easily.
- So, we know since the oxide layer hinders the burning of the remove we have to remove it. To do so we have to clean the surface of the ribbon. Cleaning the surface of the magnesium ribbon will remove the oxide layer from the surface and thus it will allow the ribbon to burn effectively to get the desired result.
The magnesium ribbon burns in air producing intense heat and producing bright white light. The oxygen from the air reacts with magnesium to form the magnesium oxide. The reaction for this is the same reaction given above: 2Mg+O2⟶2MgO