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Al2O3 + 6 HCl → 2 AlCl3 + 3 H2O
b)fosforan(V)sodu
3 Na2O + 2 H3PO4 → 2 Na3PO4 + 3 H2O
c)siarczan(VI) żelaza(III)
Fe2O3 + 3 H2SO4 → Fe2(SO4)3 + 3 H2O
b)3Na₂O+2H₃PO₄----->2Na₃PO₄+3H₂O
c)Fe₂O₃+3H₂SO₄---->Fe₂(SO₄)₃+3H₂O