Cu(OH)₂ + 2HCl = CuCl₂ + 2H₂O
Zn + 2HCl = ZnCl₂ + H₂↑
CaO + 2HCl = CaCl₂ + H₂O
KOH + HCl = KCl + H₂O
Na₂CO₃ + 2HCl = 2NaCl + CO₂ + H₂O
Cu + HCl = CuCl₂ + H₂↑