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Cr+6H⁺+3SO₄²⁻--->2Cr³⁺+3SO₄²⁻+3H₂
Cr+6H⁺+--->2Cr³⁺+3H₂
MgO+SO₃--->MgSO₄ - siarczan(VI) magnezu
MgO+SO₃--->Mg²⁺+SO₄²⁻
Ba(NO₃)₂+K₂SO₄--->BaSO₄↓+2KNO₃ siarczan (VI) baru i azotan(V) potasu
Ba²⁺+2NO₃⁻+2K⁺+SO₄²⁻--->BaSO₄↓+2K⁺+2NO₃⁻
Ba²⁺+SO₄²⁻--->BaSO₄↓
FeO+2HCl--->FeCl₂+H₂O - chlorek żelaza(II)
FeO+2H⁺+2Cl⁻--->Fe²⁺+2Cl⁻+H₂O
FeO+2H⁺--->Fe²⁺+H₂O