reaktionsligning på ???

Vand indgår i reaktionen:

Mg (s) + 2 H+ (aq) + 2 Cl- (aq) --> H₂ (g) + Mg⁺² (aq) + 2 Cl- (aq)
 

Netto reaktionen er:

Mg (s) + 2 H+ (aq) --> H₂ (g) + Mg+2 (aq)

Du for altså lavet brint gas (eksplosiv/brændbar).

Vær forsigtig ved arbejdet med rent magnesium (på pulverform). Du får smørren fra Wiki her:

"Magnesium metal and alloys are highly flammable in their pure form when molten, as a powder, or in ribbon form. Burning or molten magnesium metal reacts violently with water. Magnesium powder is an explosive hazard. One should wear safety glasses while working with magnesium, and if burning it, these should include a heavy U.V. filter, similar to welding eye protection. The bright white light (including ultraviolet) produced by burning magnesium can permanently damage the retinas of the eyes, similar to welding arc burns.[18]

Water should not be used to extinguish magnesium fires, because it can produce hydrogen which will feed the fire, according to the reaction:[19]

Mg (s) + 2 H2O (g) → Mg(OH)2 (s) + H2 (g)
 

or in words:
 

Magnesium (solid) + steam → Magnesium hydroxide (solid) + Hydrogen (gas)
Carbon dioxide fire extinguishers should not be used, because magnesium can burn in carbon dioxide (forming magnesium oxide, MgO, and carbon).[20] A Class D dry chemical fire extinguisher should be used, or the fire can be covered with sand or magnesium foundry flux. An easy way to extinguish small metal fires is to place a polyethylene bag filled with dry sand atop the fire. The heat of the fire will melt the bag, releasing the sand onto the fire." - kilde: Wikipedia

Okay, mange gange tak :)

Mvh

Elisabeth