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2Mg + O2------>2MgO
...................tlenek magnezu
MgO + 2HCl----->MgCl2 + H2
...................chlorek magnezu
Mg + 2H2O------->Mg(OH)2 + H2
...............wodorotlenek magnezu
MgO + H2O----->Mg(OH)2
...............wodorotlenek magnezu
b)
4P + 3O2----->2P2O3
...............tlenek fosforu(III)
P2O3 + O2---->P2O5
............tlenek fosforu(VI)
P2O5 + 3H2O---->2H3PO4
..................kwas fosforowy(V)
H3PO4 + 3KOH---->K3PO4 + 3H2O
...................fosforan(V) potasu
P2O5 + 3CaO---->Ca3(PO4)2
...............fosforan(V) wapnia