Chemical reaction equation of magnesium combustion in carbon dioxide

2mg + CO2 = ignition = 2MgO + C

Chemical reaction equation between magnesium reagent and magnesium hydroxide

No reaction, magnesium hydroxide is white colloidal precipitation. If there is very little magnesium ion, it is impossible to accurately determine whether there is precipitation after precipitation, so magnesium reagent needs to be added. Magnesium reagent is purple, and its dilute solution is also purple. However, if there is magnesium hydroxide colloid in the solution, magnesium hydroxide colloid will be adsorbed on magnesium hydroxide colloid, making it blue

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