H2SO4+Ba(OH)2=BaSO4↓+2H2O
2H⁺+SO4⁻²+Ba⁺²+2OH⁻=BaSO4↓+2H2O
H2SO4+Mg=MgSO4+H2↑
2H⁺+SO4⁻²+Mg⁰=Mg⁺²+SO4⁻²+H2↑
2H⁺+Mg⁰=Mg⁺²+H2
FeO+H2SO4=FeSO4+H2O
FeO↓+2H⁺+SO4⁻²=Fe⁺²+SO4⁻²+H2O
FeO↓+2H⁺=Fe⁺²+H2O
Ba(NO3)2+H2SO4=BaSO4↓+2HNO3
Ba⁺²+2NO3⁻+2H⁺+SO4⁻²=BaSO4↓+2H⁺+2NO3⁻
Ba⁺²+SO4⁻²=BaSO4↓
Dвозд(Н2S)=М(Н2S)/М возд=34/29=1,172