FeCl₂ + 2NaOH = Fe(OH)₂↓ + 2NaCl
Fe²⁺ + 2Cl⁻ + 2Na⁺ + 2OH⁻ = Fe(OH)₂↓ + 2Na⁺ + 2Cl⁻
Fe²⁺ + 2OH⁻ = Fe(OH)₂↓
условно так:
CuCl₂ + H₂S = CuS↓ + 2HCl
Cu²⁺ + 2Cl⁻ + 2H⁺ + S²⁻ = CuS↓ + 2H⁺ + 2Cl⁻
Cu²⁺ + S²⁻ = CuS↓
FeCl₂ + 2NaOH = Fe(OH)₂↓ + 2NaCl
Fe²⁺ + 2Cl⁻ + 2Na⁺ + 2OH⁻ = Fe(OH)₂↓ + 2Na⁺ + 2Cl⁻
Fe²⁺ + 2OH⁻ = Fe(OH)₂↓
условно так:
CuCl₂ + H₂S = CuS↓ + 2HCl
Cu²⁺ + 2Cl⁻ + 2H⁺ + S²⁻ = CuS↓ + 2H⁺ + 2Cl⁻
Cu²⁺ + S²⁻ = CuS↓