S+Mg=MgS
2MgS+O2=2MgO+SO2
2SO2+O2 =2SO3
SO3+2NaOH=Na2SO4+H2O
Na2SO4+BaCl2=BaSO4+2NaCl
2Na(+)+SO4(2-)+Ba(2+)+2Cl(-)=BaSO4+2Na(+)+2Cl(-)
SO4(2-)+Ba(2+)=BaSO4(осадок)
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S+Mg=MgS
2MgS+O2=2MgO+SO2
2SO2+O2 =2SO3
SO3+2NaOH=Na2SO4+H2O
Na2SO4+BaCl2=BaSO4+2NaCl
2Na(+)+SO4(2-)+Ba(2+)+2Cl(-)=BaSO4+2Na(+)+2Cl(-)
SO4(2-)+Ba(2+)=BaSO4(осадок)