Ответ:
2. MgCI₂+2NaOH= Mg(OH)₂↓+2NaCI
Mg²+2CI⁻+2Na⁺+2OH⁻= Mg(OH)₂↓+2Na⁺+2CI⁻
Mg²+2CI⁻+2Na⁺+2OH⁻= Mg(OH)₂↓
Mg²⁺+2CI⁻+2K⁺+SO₄²⁻⇄ Mg²⁺+SO₄²⁻+2K⁺+2CI⁻
MgCI₂+K₂CO₃= MgCO₃↓+2KCI
Mg²⁺+2CI⁻+2K⁺+CO₃²⁻= MgCO₃↓+2K⁺+2CI⁻
Mg²⁺+CO₃²⁻= MgCO₃↓
Mg²⁺+2CI⁻+Zn²⁺2NO₃⁻⇄Mg²⁺+2NO₃⁻+Zn²⁺+2CI⁻
3MgCI₂+2K₃PO₄=Mg₃(PO₄)₂↓+6KCI
3Mg²⁺+6CI⁻+6K⁺+2PO₄³⁻=Mg₃(PO₄)₂↓+6K⁺+6CI⁻
3Mg²⁺+6CI⁻+6K⁺+2PO₄³⁻=Mg₃(PO₄)₂↓
MgCI₂+Na₂S= MgS↓+2NaCI
Mg²⁺+2CI⁻+2Na⁺+S²⁻= MgS↓+2Na⁺+2CI⁻
Mg²⁺+S²⁻= MgS↓
3.
а) K₂CO₃+2HCI=2KCI+CO₂↑+H₂O
2K⁺+CO₃²⁻+2H⁺+2CI⁻=2K⁺+2CI⁻+CO₂↑+H₂O
CO₃²⁻+2H⁺=CO₂↑+H₂O
б) Na₂S+H₂SO₄= Na₂SO₄+H₂S↑
2Na⁺+S²⁻+2H⁺+SO₄= 2Na⁺+SO₄²⁻+H₂S↑
S²⁻+2H⁺= +H₂S↑
в) ZnCI₂+HNO₃≠
г) Na₂SO₃+H₂SO₄=Na₂SO₄+SO₂↑+H₂O
2Na⁺+SO₃²⁻+2H⁺+SO₄²⁻=2Na⁺+SO₄²⁻+SO₂↑+H₂O
SO₃²⁻+2H⁺=SO₂↑+H₂O
д) CuSO₄+HNO₃≠