1) 2NaOH+CuSO₄=Na₂SO₄+Cu(OH)₂
2Na+2OH+Cu+SO₄=2Na+SO₄+Cu(OH)₂
2OH+Cu=Cu(OH)₂
2) Mg(OH)₂+2HCl=MgCl₂+2H₂O
Mg+2OH+2H+2Cl=Mg+2Cl+2H₂O
2OH+2H=2H₂O
3) Ag₂S+2HNO₃=2AgNO₃+H₂S
Ag₂S+2H+2NO₃=2Ag+2NO₃+2H+S
Ag₂S=2Ag+S
4) 2AgNO₃+BaCl₂=2AgCl+Ba(NO₃)₂
2Ag+2NO₃+Ba+2Cl=2AgCl+Ba+(NO₃)₂
2Ag+2Cl=2AgCl
5) 6NaOH + Al₂(SO₄)₃ = 2Al(OH)₃ + 3Na₂SO₄
6Na+6OH+2Al+3SO₄=2Al(OH)₃+6Na+3SO₄
6OH+2Al=2Al(OH)₃
7)Ca+2H₂O=Ca(OH)₂+H₂
Ca+2H₂O=Ca+2OH+H₂
2H₂O=2OH+H₂
8)CuO+2HNO₃=Cu(NO₃)₂+H₂O
CuO+2H+2NO₃=Cu+2NO₃+H₂O
CuO+2H=Cu+H₂O
9) 2NaOH+CO₂=Na₂CO₃+H₂O
2Na+2OH+CO₂=2Na+CO₃+H₂O
2OH+CO₂=CO₃+H₂O