1. CuCl₂ + 2NaOH = 2NaCl + Cu(OH)₂↓
2. H₂S + 2NaOH = Na₂S + 2H₂O
3. HCl + NaOH = NaCl + H₂O
4. CuCl₂ + H₂S = CuS↓ + 2HCl
1. CuCl₂ + 2NaOH = 2NaCl + Cu(OH)₂↓
2. H₂S + 2NaOH = Na₂S + 2H₂O
3. HCl + NaOH = NaCl + H₂O
4. CuCl₂ + H₂S = CuS↓ + 2HCl