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1) Ag₂S↓ ===> AgNO3 i K₂S
2) 2AgNO₃ + K₂S ---> Ag₂S↓ + 2KNO₃
3) 2Ag⁺ + 2NO₃⁻ + 2K⁺ + S²⁻ ---> Ag₂S↓ + 2K⁺ + 2NO₃⁻
2Ag⁺ + S²⁻ ---> Ag₂S↓
b) PbSO₄ ↓
1) PbSO₄↓ =====> Pb(NO₃)₂ i Na₂SO₄
2) Pb(NO₃)₂ + Na₂SO₄ ---> PbSO₄↓ + 2NaNO₃
3) Pb²⁺ + 2NO₃⁻ + 2Na⁺ + SO₄²⁻ ---> PbSO₄↓ + 2Na⁺ + 2NO₃⁻
Pb²⁺ + SO₄²⁻ ---> PbSO₄↓
c) ZnCO₃↓
1) ZnCO↓₃ ===> ZnCl₂ i K₂CO₃
2) ZnCl₂ + K₂CO₃ ------> ZnCO₃↓ + 2KCl
3) Zn²⁺ + 2Cl⁻ + 2K⁺ + CO₃²⁻ ------> ZnCO₃↓ + 2K⁺ + 2Cl⁻
Zn²⁺ + CO₃²⁻ ------> ZnCO₃↓