9.7 The Chemistry of Magnesium

Chemical Concepts Demonstrated: Chemistry of active metals, chemistry of magnesium


Strips of ignited Mg are immersed into flasks filled with the following gases.



O2 2 Mg (s) + O2 (g) ---> 2 MgO (s)  A bright white light is produced.
N2 3 Mg (s) + N2 (g) ---> Mg3N2 (s)
CO2 2 Mg (s) + CO2(g) ---> 2 MgO (s) + C (s)  (Note: A CO2 fire extinguisher should NOT be used to fight active metal fires!!!)
SO2 2 Mg (s) + SO2 (g) ---> 2 MgO (s) + S (s)
H2 Mg (s) + H2 (g) ----> MgH2 (s) (When dissolved in water, this produces a basic solution)
H2S Mg (s) + H2S (g) ---> MgS (s) + H2 (g) (When dissolved in water, the magnesium compound produces a basic solution)
Cl2 Mg (s) + Cl2 (g) ---> MgCl2(s)
NH3 3 Mg (s) + NH3 (g) ---> Mg3N2 (s) + 3 H2 (g)
Boiling water Mg (s) + H2O (g) ---> MgO (s) + H2 (g)