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Question
Give the main experimental points only to demonstrate that magnesium.
Solution
Experiment to show that magnesium gains weight on burning:
Take dry crucible with lid. Put a small piece of magnesium in it and cover the lid. Find its weight with lid covering it. Let it be 50 gms.
Now heat the crucible along with magnesium and lid just opened for a while. Taking care that no ash comes out. Let it cool covering the lid and products formed weight it again. The weight now will be more. Let it be 50.82 gms, oxygen combined is 50.82 – 50 = 0.82 gms this shows that something is added to magnesium, which has increased its weight. This 0.82 gm is the weight of oxygen added to magnesium.
2Mg + O2 → 2MgO
Hence magnesium gains weight on burning.
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