1. FeCl₂+2KOH=Fe(OH)₂↓+2KCI
Fe²⁺+2OH⁻=Fe(OH)₂↓
2. Na₂SO₃+2HBr=2NaBr + SO₂↑ + H₂O
SO₃²⁻+ 2H⁺ = SO₂↑ + H₂O
3. Na₂SO₄+H₃PO₄≠
4. CuCl₂+Na₂S=CuS↓+2NaCI
Cu²⁺+ S²⁻= CuS↓
1. FeCl₂+2KOH=Fe(OH)₂↓+2KCI
Fe²⁺+2OH⁻=Fe(OH)₂↓
2. Na₂SO₃+2HBr=2NaBr + SO₂↑ + H₂O
SO₃²⁻+ 2H⁺ = SO₂↑ + H₂O
3. Na₂SO₄+H₃PO₄≠
4. CuCl₂+Na₂S=CuS↓+2NaCI
Cu²⁺+ S²⁻= CuS↓