This wonderful experiment looks like very simple, but it involve many interesting chemical process.
On heating magnesium bonce with formation of magnesium oxide which shine brightly.
Reagents and equipment
- Magnesium strip
- Hot water
- Phenolphthalein solution
- Beaker
- Spirit burner
- Tweezers
- Lighter or matches
Step by step instructions
- Take hot water in a beaker and a spirit burner.
- Burn the magnesium strip in the flame of the spirit burner.
- Then dip it into the beaker of hot water.
Process.
Magnesium is a highly reactive alkaline earth metal, but its surface is covered with protective oxide film. On heating this film breaks and the magnesium burns with a blinding white flame. Here magnesium oxide and magnesium nitride, which also shine brightly. Magnesium react with water vapor, and hydrogen is released intensifies the flame. Magnesium oxide reacts with water to form the magnesium hydroxide, which is a weak base. In an alkaline medium the indicator turns purple also the magnesium nitride formed get hydrolyzed with the formation of magnesium hydroxide and ammonium. When ammonium dissolves in water to form ammonium hydroxide it also turn the water into pink
2Mg + O2 → 2MgO
3Mg + N2 → Mg3N2
Mg+H2O → Mgo+H2
Mg+2H2O → Mg(OH)2 + H2
MgO + H2O → Mg(OH)2
Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3
NH3 + H2O → NH4OH
3Mg + N2 → Mg3N2
Mg+H2O → Mgo+H2
Mg+2H2O → Mg(OH)2 + H2
MgO + H2O → Mg(OH)2
Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3
NH3 + H2O → NH4OH
Warning! : Use tweezers when lighting the magnesium. You should look at the burning magnesium through dark glasses, as there is a risk of receiving a burn to the retina of eye and going blind.
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