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a)
Fe(NO₃)₂ + K₂S ====> 2 KNO₃ + FeS↓
Fe²⁺ + 2 NO₃⁻ + 2 K⁺ + S²⁻ ====> 2 K⁺ + 2 NO₃⁻ + FeS↓
Fe²⁺ + S²⁻ ====> FeS↓
b)
Ba(NO₃)₂ + Na₂SO₃ ====> BaSO₃↓ + 2 NaNO₃
Ba²⁺ + 2 NO₃⁻ + 2 Na⁺ + SO₃²⁻ ====> BaSO₃↓ + 2 Na⁺ + 2 NO₃⁻
Ba²⁺ + SO₃²⁻ ====> BaSO₃↓
c)
Pb(NO₃)₂ + Na₂SO₄ ====> PbSO₄↓ + 2 NaNO₃
Pb²⁺ + 2 NO₃⁻ + 2 Na⁺ + SO₄²⁻ ====> PbSO₄↓ + 2 Na⁺ + 2 NO₃⁻
Pb²⁺ + SO₄²⁻ ====> PbSO₄↓
d)
ZnCl₂ + Pb(NO₃)₂ ====> Zn(NO₃)₂ + PbCl₂↓
Zn²⁺ + 2 Cl⁻ + Pb²⁺ + 2 NO₃⁻ ====> Zn²⁺ + 2 NO₃⁻ + PbCl₂↓
2 Cl⁻ + Pb²⁺ ====> PbCl₂↓
e)
3 Ba(NO₃)₂ + Al₂(SO₄)₃ ====> 2 Al(NO₃)₃ + 3 BaSO₄↓
3 Ba²⁺ + 6 NO₃⁻ + 2 Al³⁺ + 3 SO₄²⁻ ====> 2 Al³⁺ + 6 NO₃⁻ + 3 BaSO₄↓
3 Ba²⁺ + 3 SO₄²⁻ ====> 3 BaSO₄↓
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