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Fe²⁺ + SO₄²⁻ + 2K⁺ + CrO₄²⁻ -> FeCrO₄ (strzałka w dół) + 2K⁺ + SO₄²⁻
Fe²⁺ + CrO₄²⁻ -> FeCrO₄
PbCl₂ + Na₂S -> PbS (strzałka w dół) + 2NaCl
Pb²⁺ + 2Cl⁻ + 2Na⁺ + S²⁻ -> PbS (strzałka w dół) + 2Na⁺ + 2Cl⁻
Pb²⁺ + S²⁻ -> PbS
CuCl₂ + 2NaOH -> Cu(OH)₂ (strzałka w dół) + 2NaCl
Cu²⁺ + 2Cl⁻ + 2Na⁺ + 2OH⁻ -> Cu(OH)₂ (strzałka w dół) + 2Na⁺ + 2Cl⁻
Cu²⁺ + 2OH⁻ -> Cu(OH)₂