Question

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

Answer 1

Hi Mate,

Magnesium (Mg) Ribbon should be cleaned before burning in air because burning in air forms a thin layer of Magnesium Oxide (MgO), to remove this thin layer, the ribbon of Magnesium Oxide should be cleaned.

Equation:

2Mg + O2 → 2MgO

Good Day...!!

Answer 2

Magnesium is a highly reactive element. It forms magnesium oxide when it combines with oxygen. This Magnesium oxide is stable and it prevents further reaction with oxygen. Therefore to remove this coating it is cleaned with sand paper.